阅读说明：本技术 基于纳米光刻光盘及其物理存储介质结构和写入读出方法 (Nano photoetching-based optical disk and physical storage medium structure and writing and reading method thereof ) 是由 王中阳 张力 于 2019-01-30 设计创作，主要内容包括：本发明提供基于纳米光刻光盘及其物理存储介质结构和写入读出方法,其中,根据纳米光刻信息写入方法的不同,基于纳米光刻光盘可分为：单光束光盘的物理存储介质结构和双光束光盘的物理存储介质结构；根据不同的光盘读取方法不同则可分为：1)多层介质膜反射光盘；2)超分辨荧光暗态光盘；3)双折射偏振光盘。本发明的技术方案结合基于纳米光刻光盘的读写方法可有效提高光盘信息读取速率和分辨能力,并极大地提升了光盘的存储密度和存储维度。(The invention provides a nano-photoetching-based optical disk, a physical storage medium structure thereof and a writing and reading method, wherein the nano-photoetching-based optical disk can be divided into the following parts according to different nano-photoetching information writing methods: physical storage medium structures of single-beam optical disks and dual-beam optical disks; according to different optical disc reading methods, the method can be divided into: 1) multilayer dielectric film reflective optical disks; 2) super-resolution fluorescent dark state optical disks; 3) birefringent polarizing optical disc. The technical scheme of the invention can effectively improve the reading speed and the resolution capability of the information of the optical disk by combining with the read-write method based on the nano photoetching optical disk, and greatly improves the storage density and the storage dimension of the optical disk.)

1. A physical storage medium structure based on nano-photoetching optical disk is characterized in that different physical storage medium structures are selected according to different nano-photoetching information writing methods based on the nano-photoetching optical disk, and the physical storage medium structure comprises the following components:

according to the double-beam nano photoetching information writing method, a physical storage medium structure of a double-beam optical disk is adopted;

according to the single-beam nano photoetching information writing method, a physical storage medium structure of a single-beam optical disk is adopted;

the physical storage medium structure of the double-beam optical disc and the physical storage medium structure of the single-beam optical disc are both multilayer structures.

2. The physical storage media structure of claim 1, wherein the physical storage media structure of the dual beam optical disc comprises, in order from the top layer to the bottom layer:

the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc;

the absorption modulation layer is used for realizing the compression of the size of a focal spot of the solid writing beam;

the recording layer is engraved and used for the nano photoetching recording of the digital storage information;

the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity when the digital information is read;

a transition protective layer with the thickness less than 10nm can be added between the absorption modulation layer and the writing recording layer to avoid the absorption modulation layer from influencing the writing recording layer.

3. The physical storage medium structure of claim 2, wherein the absorption modulation layer is made of a material that is stable and long-lasting, has a thickness of less than 500nm, and has absorption modulation characteristics.

4. The physical storage media structure of claim 3, wherein the absorption modulation characteristic is that the material exists in two states, state 1 and state 2, respectively, wherein the material in state 1 is for the wavelength λ₂Has strong light absorption and wave-pairingLong lambda₁The light of (2) is weakly absorbed; the material in state 2 is then at wavelength λ₂Has weak light absorption and has a wavelength of lambda₁The light absorption of (2) is strong, and the material comprises diaryl ethylene, fulgide or azide materials.

5. The physical storage medium structure of claim 2, wherein the transition protection layer has a thickness of less than 10nm and is made of a material including PVA (polyvinyl alcohol), PMMA (polymethyl methacrylate).

6. The physical storage media structure of claim 1, wherein the physical storage media structure of the single beam optical disc comprises, in order from a top layer to a bottom layer:

the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc;

the recording layer is engraved and used for the nano photoetching recording of the digital storage information;

and the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity during information reading.

7. The physical storage medium structure of claim 1, wherein the nanolithography-based optical disc selects different writing recording layer materials according to different optical disc reading methods.

8. The physical storage medium structure of claim 7, wherein the nanolithography-based optical disc is classified according to different optical disc reading methods into: 1) multilayer dielectric film reflective optical disks; 2) super-resolution fluorescent dark state optical disks; 3) birefringent polarizing optical disc.

9. The physical storage media structure of claim 8, wherein the multilayer dielectric film reflective optical disc reading method is a reflection spectroscopy measurement method; according to the reflection spectrum measuring method, the selected material of the writing recording layer comprises: SiO2, GaF2, MgF2, plexiglass, or a photosensitive material.

10. The physical storage medium structure of claim 9, wherein the reflective layer of the multi-layer dielectric film reflective optical disc is made of a material with high reflectivity, and mainly comprises a metal material or a multi-layer Distributed Bragg Reflector (DBR) material.

11. The physical storage medium structure of claim 9, wherein the digital information reading resolution of the reflection spectrum measurement reading method depends on the reflection spectrum difference and the spectrum reading resolution, and the dual-beam multilayer dielectric film reflective optical disc achieves the improvement of the reflection spectrum difference and the spectrum reading resolution by adding an intermediate layer of a high refractive index material between the writing recording layer and the reflection layer.

12. The physical storage media structure of claim 11, wherein the refractive index of the intermediate layer of the dual beam multi-layer dielectric film reflective optical disc is larger than the material of the writing recording layer, and the thickness of the material of the intermediate layer is smaller than the measuring wavelength.

13. The physical storage media structure of claim 9, wherein the optical disc based on the reflectance spectroscopy measurement method comprises a single-beam multilayer dielectric film reflective optical disc and a two-beam multilayer dielectric film reflective optical disc.

14. The physical storage media structure of claim 13, wherein the physical storage media structure of the dual-beam multi-layer dielectric film reflective optical disc comprises, in order from top to bottom:

the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc;

the absorption modulation layer is used for realizing the compression of the size of a focal spot of the solid writing beam;

the transition protective layer is used for protecting the influence of the absorption modulation layer on the writing recording layer;

the recording layer is engraved and used for the nano photoetching recording of the digital storage information;

the middle layer is used for improving the reflection spectrum difference and the spectrum reading resolution capability;

and the reflecting layer is used for improving the information reading capability of the optical disc and facilitating the reflection measurement of the spectral information.

15. The single beam multi-layer dielectric film reflective optical disc as defined in claim 13 wherein the physical storage media structure of said dual beam multi-layer dielectric film reflective optical disc comprises, in order from top to bottom:

the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc;

the transition protective layer is used for protecting the influence of the absorption modulation layer on the writing recording layer;

the recording layer is engraved and used for the nano photoetching recording of the digital storage information;

the middle layer is used for improving the reflection spectrum difference and the spectrum reading resolution capability;

and the reflecting layer is used for improving the information reading capability of the optical disc and facilitating the reflection measurement of the spectral information.

16. The physical storage medium structure of claim 8, wherein the multi-layer dielectric film reflective optical disc comprises a multi-layer dielectric cavity structured reflective optical disc, and the physical storage medium of the optical disc is formed by: after the optical writing of the writing recording layer is finished, cleaning the absorption modulation layer of the optical disc by a chemical method such as ultrasonic, and after cleaning, turning the writing recording layer 180 degrees to form a writing recording layer with a second surface under and a first surface above, which finishes the optical writing, so that the second surface is overlapped with the original reflecting layer, the reflecting layer 2 is newly plated on the first surface, and a medium cavity is formed between the reflecting layer 2 and the original optical disc reflecting layer 1; the reflective layer 2 is also a protective layer of the optical disc and is made of a material including a metal material including gold or silver or a multi-layer DBR material.

17. The physical storage media structure of claim 16, wherein the media cavity structure makes the lifetime of the spectral information dependent only on the lifetime of the write recording layer, so as to permanently preserve the stored information and increase the storage density and capacity.

18. The physical storage media structure of claim 8, wherein the super-resolution fluorescent dark state optical disc reading method is a super-resolution fluorescent dark state reading method; the super-resolution fluorescent dark-state optical disc selects a writing recording layer material which can be stably stored, has high fluorescent efficiency and stability and can be optically written; the writing recording layer material selected according to the super-resolution fluorescent dark state reading method comprises the following steps: 8-hydroxyquinoline (AIQ-3), DPVBi, Rubrene (Rubrene) and a curing agent.

19. The physical storage medium structure of claim 18, wherein the writing recording layer of the super-resolution fluorescent dark state optical disc has a thickness greater than 1/2 writing laser wavelength.

20. The physical storage media structure of claim 18, wherein the super-resolution fluorescent dark state optical disc realizes multi-layer super-resolution fluorescent dark state optical disc digital information storage according to two-photon absorption characteristics of an absorption modulation material; the physical storage medium structure of the multilayer super-resolution fluorescent dark-state optical disk sequentially comprises the following components from the top layer to the bottom layer:

a protective layer for protecting the optical disc storage medium structure;

a multi-layer information writing recording layer for recording data of the optical disc;

and a base layer for protecting a physical storage medium structure of the optical disc.

21. The physical storage media structure of claim 20, wherein the multi-layer super-resolution fluorescent dark-state optical disc comprises: a dual-beam multilayer super-resolution fluorescent dark state optical disk and a single-beam multilayer super-resolution fluorescent dark state optical disk.

22. The physical storage medium structure of claim 21, wherein the multi-layer information writing recording layer of the dual-beam multi-layer super-resolution fluorescent dark state optical disc is formed by interleaving multiple layers of fluorescent recording materials and absorption modulation materials; the structure of the multilayer ceramic capacitor comprises 2n layers, wherein n is more than or equal to 1; wherein:

the odd layers from the 1 st layer to the 2n layer are absorption modulation layers and are used for realizing the compression of the size of a focal spot of the solid writing beam;

the even layers from the 1 st layer to the 2n layer are fluorescence writing recording layers for fluorescence dark state nanometer photoetching information recording.

23. The single-beam multilayer super-resolution fluorescent dark state optical disc as defined in claim 21, wherein the multilayer information writing recording layer of the single-beam multilayer super-resolution fluorescent dark state optical disc is formed by interleaving a plurality of layers of fluorescent recording materials with absorption modulation materials; the structure of the multilayer ceramic capacitor comprises 2n layers, wherein n is more than or equal to 1; wherein:

odd layers from the 1 st layer to the 2n th layer are fluorescence writing recording layers and are used for fluorescence dark-state nanometer photoetching information recording;

the even layers from the 1 st layer to the 2n layer are transition protective layers for protecting the interaction between the fluorescent writing recording layers.

24. The physical storage media structure of claim 8, wherein the birefringent polarizing optical disc reading method is a polarization balance measurement method; the writing recording layer of the birefringence polarization optical disk adopts birefringence materials to realize the nano photoetching information recording.

25. The physical storage media structure of claim 24, wherein the birefringent material has birefringent properties, is capable of being optically written to, and has stable material properties for long term storage, and comprises any one or more of the following materials in combination:

the film polarization material formed by the dielectric film stack adopts materials including MgF2, SiO2, ZrO2, TiO2 or HfO2 by a physical vapor deposition method;

an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material;

a birefringent sculpturing film, the film material comprising SiO2, TiO2, or ZnS;

a birefringent crystalline material comprising calcite, lithium niobate, lithium tantalate, or barium niobate;

the optical rotation material, the polarization plane of which changes when light passes through the material, comprises quartz and any one or combination of more of optical rotation high molecular polymers.

26. The physical storage media structure of claim 24, wherein the birefringent polarizing optical disc comprises: dual beam birefringent polarizing discs and single beam birefringent polarizing discs.

27. The physical storage medium structure of claim 24, wherein the writing layer of the birefringent polarizing optical disc is made of a photo-induced birefringent material to realize nano-lithography information recording, which can erase the stored information of the optical disc after uniform illumination or heating, so as to realize the reuse of the optical disc.

28. The physical storage media structure of claim 27, wherein the optically birefringent material has optically induced birefringence, is capable of being optically written, and has stable material properties for long-term storage, and comprises:

an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material;

and the metal ion doped lithium niobate crystal material comprises ferromanganese double doping, Mg or Fe.

29. The physical storage media structure of claim 27, wherein the optical disc of the optical disc readout method based on the photo-induced birefringence effect comprises: dual-beam optically birefringent optical discs and single-beam optically birefringent optical discs.

30. The physical storage media structure of claim 1, wherein both sides of the optical disc have the same physical storage media structure to achieve double-sided high-density information storage.

31. A writing and reading method based on nano photoetching optical disk is characterized in that different optical disk physical storage medium structures are selected according to different photoetching information writing methods, and the method comprises the following steps:

selecting a physical storage medium structure of the dual-beam optical disc according to a dual-beam nano photoetching information writing method;

selecting a physical storage medium structure of the single-beam optical disc according to a single-beam nanolithography information writing method;

the physical storage medium structure of the double-beam optical disc and the physical storage medium structure of the single-beam optical disc are both multilayer structures.

32. The method of claim 31 wherein the physical storage media structure of the dual beam optical disc comprises, in order from top to bottom:

the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc;

an absorption modulation layer for absorption and modulation of a material;

the transition protective layer is used for protecting the influence of the absorption modulation layer on the writing recording layer;

the writing recording layer is used for realizing a double-beam nano photoetching mechanism;

and the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity during information reading.

33. The method as claimed in claim 31, wherein the physical storage medium structure of the single beam optical disc comprises, in order from the top layer to the bottom layer:

the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc;

a writing recording layer for performing writing recording of information;

and the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity during information reading.

34. The method of claim 31, further comprising: according to different optical disk reading methods, different materials for writing recording layer of optical disk are selected.

35. A nanolithography-based optical disc comprising the physical storage media structure of any one of claims 1 to 30.

Technical Field

The present application relates to the field of optical disc information storage technology, and in particular, to a nano-lithography-based optical disc, a physical storage medium structure thereof, and a writing and reading method.

Background

With the development of technologies such as gene sequencing and brain activity reading, not only a large amount of data is generated, but also higher requirements are put forward on how to effectively, stably and accurately store the data. Based on the above background, the optical disc storage technology has advantages of energy saving, long storage life, good safety, easy processing, etc., and thus, the optical disc storage technology well complies with the requirements of the times. For optical disc technology, the limitation of storage capacity has seriously hindered the development of optical disc technology.

In order to increase the capacity of an optical disc, the conventional technical route is to reduce the size of a recording spot. With the successful development of short wavelength laser diodes (GaN blue-green lasers), blu-ray discs are becoming the mainstream storage mode in the optical disc market. In the early CD, the recording laser wavelength was 780nm, the numerical aperture was 0.45, the track pitch was 1.6 μm, and the single-layer storage capacity was only 650 MB; later DVD optical disk, recording laser wavelength is 650nm, numerical aperture is 0.6, track pitch is 0.74 μm, single-layer storage capacity is 4.7 GB; the current blue-ray disc has the recording laser wavelength of 405nm, the numerical aperture of 0.85 and the track spacing of 0.32 mu m, the track spacing is only half of that of a red-ray DVD disc (0.74 mu m), the single-layer storage capacity is up to 25GB, and meanwhile, the blue-ray disc achieves the multi-layer writing effect by utilizing different reflectivities, thereby realizing 12-layer 300GB blue-ray disc storage.

In order to further break through the limitation of the storage capacity of the optical disc, some methods for improving the storage capacity are also proposed by scientific research workers, for example, a 2009 australian sensitivity study team uses the response difference of gold nanowires with different length-width ratios to lasers with different wavelengths and polarization directions to realize three-layer five-dimensional (x, y, z, lambda and polarization) optical information storage (Nature,2009, 459(7245): 410-) 413) within a thickness of 10 μm, and for example, a 2011 S.W hel study team proposes a novel microscopic technology RESO L FT (reversible storage optical 'fluorescent' transition between wo states) which can be used for super-resolution optical storage reading and writing, and realizes a 250nm dot spacing high-density optical storage experiment (Nature, 204, 208) or a hypersensitive optical protein (rsegp) optical curing and optical switching characteristics by a super-resolution writing reading method, and a 250nm dot spacing high-density optical storage experiment (Nature, 204 nm, or for example, a australian sensitivity study channel information collection system, a 2013, a hypersensitive optical storage system, a simulated optical storage optical information system, a simulated optical storage system, a simulated optical information system, a simulated optical storage mechanism, a simulated optical storage system, a simulated optical storage optical information system, a simulated optical storage system, a simulated optical information system, a simulated optical storage system, a simulated optical information system, a simulated optical storage system.

However, the existing methods have limited storage capacity, and there is still a need in the art for more efficient means for increasing storage capacity.

Content of application

In view of the above-mentioned shortcomings of the prior art, the present application aims to provide a nanolithography-based optical disc, a physical storage medium structure thereof, and a writing and reading method, which are used to solve the technical problem of limited storage capacity of the optical disc in the prior art.

To achieve the above and other related objects, a first aspect of the present application provides a physical storage medium structure based on a nanolithography optical disc, wherein the nanolithography optical disc selects different physical storage medium structures according to different nanolithography information writing methods, and the physical storage medium structure based on the nanolithography optical disc comprises: according to the double-beam nano photoetching information writing method, a physical storage medium structure of a double-beam optical disk is adopted; according to the single-beam nano photoetching information writing method, a physical storage medium structure of a single-beam optical disk is adopted; the physical storage medium structure of the double-beam optical disc and the physical storage medium structure of the single-beam optical disc are both multilayer structures.

In some embodiments of the first aspect of the present application, the physical storage medium structure of the dual beam optical disc comprises, in order from the top layer to the bottom layer: the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc; the absorption modulation layer is used for realizing the compression of the size of a focal spot of the solid writing beam; the recording layer is engraved and used for the nano photoetching recording of the digital storage information; the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity when the digital information is read; a transition protective layer with the thickness of less than 10nm can be added between the absorption modulation layer and the writing recording layer according to requirements, so as to avoid the absorption modulation layer from influencing the writing recording layer.

In some embodiments of the first aspect of the present application, the absorption modulation layer has a thickness of less than 500nm, the layer material has absorption modulation characteristics, and the material properties are stable and long-lasting.

In some embodiments of the first aspect of the present application, the absorption modulation characteristic is that the material exists in two states, state 1 and state 2, respectively, wherein the material in state 1 is at the wavelength λ₂Has strong light absorption to the wavelength lambda₁The light of (2) is weakly absorbed; the material in state 2 is then at wavelength λ₂Has weak light absorption and has a wavelength of lambda₁The light absorption of (2) is strong, and the material comprises diaryl ethylene, fulgide or azide materials. .

In some embodiments of the first aspect of the present application, the thickness of the transition protection layer is less than 10nm, and the material thereof includes PVA (polyvinyl alcohol), PMMA (polymethyl methacrylate).

In some embodiments of the first aspect of the present application, the physical storage medium structure of the single-beam optical disc comprises, in order from the top layer to the bottom layer: the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc; the recording layer is engraved and used for the nano photoetching recording of the digital storage information; and the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity during information reading.

In some embodiments of the first aspect of the present application, the nanolithography-based optical disc selects different writing recording layer materials according to different optical disc reading methods.

In some embodiments of the first aspect of the present application, the optical disc based on nanolithography is classified according to different optical disc reading methods into: 1) multilayer dielectric film reflective optical disks; 2) super-resolution fluorescent dark state optical disks; 3) birefringent polarizing optical disc.

In some embodiments of the first aspect of the present application, the method for reading a multilayer dielectric film reflective optical disc is a reflectance spectroscopy measurement method; according to the reflection spectrum measuring method, the selected writing recording layer material can be stably stored, has higher fluorescence efficiency and stability, and can be optically written, including: SiO2, GaF2, MgF2, plexiglass, or a photosensitive material.

In some embodiments of the first aspect of the present application, the reflective layer of the multi-layer dielectric film reflective optical disc is made of a material with a relatively high reflectivity, and mainly includes a metal material or a multi-layer Distributed Bragg Reflector (DBR) material.

In some embodiments of the first aspect of the present application, the digital information reading resolution of the reflection spectrum measurement reading method depends on the reflection spectrum difference and the spectrum reading resolution, and the dual-beam multilayer dielectric film reflective optical disc achieves the improvement of the reflection spectrum difference and the spectrum reading resolution by adding the intermediate layer of the high refractive index material between the writing recording layer and the reflection layer.

In some embodiments of the first aspect of the present application, the refractive index of the intermediate layer of the dual-beam mldm reflective optical disc is greater than the material of the writing recording layer, and the thickness of the intermediate layer is smaller than the measurement wavelength.

In some embodiments of the first aspect of the present application, the optical disc based on the reflectance spectroscopy method includes a single-beam multilayer dielectric film reflective optical disc and a two-beam multilayer dielectric film reflective optical disc.

In some embodiments of the first aspect of the present application, the physical storage medium structure of the dual-beam multi-layer dielectric film reflective optical disc sequentially comprises, from top to bottom: the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc; the absorption modulation layer is used for realizing the compression of the size of a focal spot of the solid writing beam; the transition protective layer is used for protecting the influence of the absorption modulation layer on the writing recording layer; the recording layer is engraved and used for the nano photoetching recording of the digital storage information; the middle layer is used for improving the reflection spectrum difference and the spectrum reading resolution capability; and the reflecting layer is used for improving the information reading capability of the optical disc and facilitating the reflection measurement of the spectral information.

In some embodiments of the first aspect of the present application, the physical storage medium structure of the dual-beam multi-layer dielectric film reflective optical disc sequentially comprises, from top to bottom: the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc; the transition protective layer is used for protecting the influence of the absorption modulation layer on the writing recording layer; the recording layer is engraved and used for the nano photoetching recording of the digital storage information; the middle layer is used for improving the reflection spectrum difference and the spectrum reading resolution capability; and the reflecting layer is used for improving the information reading capability of the optical disc and facilitating the reflection measurement of the spectral information.

In some embodiments of the first aspect of the present application, the multilayer dielectric film reflective optical disc includes a multilayer dielectric cavity structured reflective optical disc, and the physical storage medium of the optical disc is formed by: after the optical writing of the writing recording layer is finished, cleaning the absorption modulation layer of the optical disc by a chemical method such as ultrasonic, and after cleaning, turning the writing recording layer 180 degrees to form a writing recording layer with a second surface under and a first surface above, which finishes the optical writing, so that the second surface is overlapped with the original reflecting layer, the reflecting layer 2 is newly plated on the first surface, and a medium cavity is formed between the reflecting layer 2 and the original optical disc reflecting layer 1; the reflective layer 2 is also a protective layer of the optical disc and is made of a material including a metal material including gold or silver or a multi-layer DBR material.

In some embodiments of the first aspect of the present application, the medium cavity structure makes the lifetime of the spectral information dependent only on the lifetime of the writing recording layer, so as to permanently preserve the stored information and increase the storage density and storage capacity.

In some embodiments of the first aspect of the present application, the super-resolution fluorescent dark state optical disc reading method is a super-resolution fluorescent dark state reading method; the writing recording layer material selected according to the super-resolution fluorescent dark state reading method comprises the following steps: 8-hydroxyquinoline (AIQ-3), DPVBi, Rubrene (Rubrene) and a curing agent.

In some embodiments of the first aspect of the present application, the writing layer of the super-resolution fluorescent dark state optical disc has a thickness greater than 1/2 writing laser wavelength.

In some embodiments of the first aspect of the present application, the super-resolution fluorescent dark state optical disc realizes multi-layer super-resolution fluorescent dark state optical disc digital information storage according to two-photon absorption characteristics of an absorption modulation material; the physical storage medium structure of the multilayer super-resolution fluorescent dark-state optical disk sequentially comprises the following components from the top layer to the bottom layer: a protective layer for protecting the optical disc storage medium structure; a multi-layer information writing recording layer for recording data of the optical disc; and a base layer for protecting a physical storage medium structure of the optical disc.

In some embodiments of the first aspect of the present application, the multilayer super-resolution fluorescent dark state optical disc comprises: a dual-beam multilayer super-resolution fluorescent dark state optical disk and a single-beam multilayer super-resolution fluorescent dark state optical disk.

In some embodiments of the first aspect of the present application, the multi-layer information writing recording layer of the dual-beam multi-layer super-resolution fluorescent dark state optical disc is formed by interleaving multiple layers of fluorescent recording material and absorption modulation material; the structure of the multilayer ceramic capacitor comprises 2n layers, wherein n is more than or equal to 1; wherein: the odd layers from the 1 st layer to the 2n layer are absorption modulation layers and are used for realizing the compression of the size of a focal spot of the solid writing beam; the even layers from the 1 st layer to the 2n layer are fluorescence writing recording layers for fluorescence dark state nanometer photoetching information recording.

In some embodiments of the first aspect of the present application, the multi-layer information writing recording layer of the single-beam multi-layer super-resolution fluorescent dark-state optical disc is formed by interleaving multiple layers of fluorescent recording materials and absorption modulation materials; the structure of the multilayer ceramic capacitor comprises 2n layers, wherein n is more than or equal to 1;

wherein: odd layers from the 1 st layer to the 2n th layer are fluorescence writing recording layers and are used for fluorescence dark-state nanometer photoetching information recording;

the even layers from the 1 st layer to the 2n layer are transition protective layers for protecting the interaction between the fluorescent writing recording layers.

In some embodiments of the first aspect of the present application, the birefringent polarizing optical disc reading method is a polarization balance measurement method; the writing recording layer of the birefringence polarization optical disk adopts birefringence materials to realize the nano photoetching information recording.

In some embodiments of the first aspect of the present application, the birefringent material has birefringent properties, is capable of being optically written and has stable material properties for long term storage, and comprises any one or more of the following materials in combination: the film polarization material formed by the dielectric film stack adopts materials including MgF2, SiO2, ZrO2, TiO2 or HfO2 by a physical vapor deposition method; an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material; a birefringent sculpturing film, the film material comprising SiO2, TiO2, or ZnS; a birefringent crystalline material comprising calcite, lithium niobate, lithium tantalate, or barium niobate; the optical rotation material, the polarization plane of which changes when light passes through the material, comprises quartz and any one or combination of more of optical rotation high molecular polymers.

In some embodiments of the first aspect of the present application, the birefringent polarizing optical disc comprises: dual beam birefringent polarizing discs and single beam birefringent polarizing discs.

In some embodiments of the first aspect of the present application, the writing recording layer of the birefringent polarizing optical disc uses a photo-induced birefringent material to realize nano-lithography information recording, which can erase the stored information of the optical disc after uniform illumination or heating, so as to realize reuse of the optical disc.

In some embodiments of the first aspect of the present application, the photo-birefringent material has a photo-birefringent property, can be optically written, and has stable material properties and long storage life, and includes: an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material; and the metal ion doped lithium niobate crystal material comprises ferromanganese double doping, Mg or Fe.

In some embodiments of the first aspect of the present application, an optical disc of an optical disc readout method based on a photo-induced birefringence effect includes: dual-beam optically birefringent optical discs and single-beam optically birefringent optical discs.

In some embodiments of the first aspect of the present application, the same physical structure of the optical disc may be extended to both sides, so as to achieve double-sided high-density information storage.

To achieve the above and other related objects, a second aspect of the present application provides a method for writing and reading based on nanolithography optical discs, selecting different physical storage medium structures of the optical discs according to different writing methods of lithography information, comprising: selecting a physical storage medium structure of the dual-beam optical disc according to a dual-beam nano photoetching information writing method; selecting a physical storage medium structure of the single-beam optical disc according to a single-beam nanolithography information writing method; the physical storage medium structure of the double-beam optical disc and the physical storage medium structure of the single-beam optical disc are both multilayer structures.

In some embodiments of the second aspect of the present application, the physical storage medium structure of the dual beam optical disc comprises, in order from the top layer to the bottom layer: the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc; an absorption modulation layer for absorption and modulation of a material; the transition protective layer is used for protecting the influence of the absorption modulation layer on the writing recording layer; the writing recording layer is used for realizing a double-beam nano photoetching mechanism; and the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity during information reading.

In some embodiments of the second aspect of the present application, the physical storage medium structure of the single-beam optical disc comprises, in order from the top layer to the bottom layer: the protective layer is used for protecting the optical disc from being damaged or affected by dirt so as to ensure the storage quality and data safety of the optical disc; a writing recording layer for performing writing recording of information; and the reflecting layer is used for improving the information reading capacity of the optical disc and improving the signal intensity during information reading.

In some embodiments of the second aspect of the present application, the recording layer materials of different optical discs are selected according to different optical disc reading methods.

To achieve the above and other related objects, a third aspect of the present application provides a nanolithography-based optical disc comprising the physical storage medium structure.

As described above, the optical disc based on nanolithography, the physical storage medium structure thereof and the writing and reading method of the present application have the following advantages:

drawings

FIG. 1 is a diagram of a single-beam nanolithography optical disc physical storage medium structure according to an embodiment of the present invention.

FIG. 2A is a diagram of a physical storage medium structure of a dual-beam nanolithography optical disc according to an embodiment of the present invention.

FIG. 2B is a diagram of a physical storage medium structure of a dual-beam nanolithography optical disc according to an embodiment of the present invention.

FIG. 3A is a schematic diagram of a dual-beam multi-layered dielectric film reflective optical disc structure according to an embodiment of the present invention.

Fig. 3B is a schematic diagram illustrating a reflectance spectrum measurement reading method according to an embodiment of the invention.

FIG. 4A is a schematic diagram of a single beam multi-layer dielectric film reflective optical disc structure according to an embodiment of the present invention.

FIG. 4B is a diagram illustrating the influence of the optimization of the structure of the physical storage medium on the spectral resolution of an optical disc according to an embodiment of the present invention.

Fig. 4C is a schematic diagram of a physical storage medium structure of a reflective optical disc with a multi-layer medium cavity structure according to an embodiment of the present invention.

FIG. 5A is a schematic diagram of a dual-beam super-resolution fluorescent dark-state optical disc structure according to an embodiment of the present invention.

FIG. 5B is a schematic diagram of a single-beam super-resolution fluorescent dark state optical disc according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a single-beam multi-layer super-resolution fluorescent dark-state optical disc structure according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a dual-beam multi-layer super-resolution fluorescent dark-state optical disc structure according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a super-resolution dark state reading method for a multi-layer super-resolution dark state optical disc according to an embodiment of the present invention.

FIG. 9A is a schematic diagram of a dual-beam birefringent polarizing optical disc structure according to an embodiment of the present invention.

FIG. 9B is a schematic diagram of a single beam birefringent polarizing disk in accordance with one embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

First embodiment

As shown in fig. 1, there is shown a physical storage medium structure of an optical disc based on single beam nanolithography, which comprises:

1) a protective layer 101 that allows the disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the disc.

2) The recording layer 102 is used for writing and recording information, and is characterized by being capable of being stably stored and being optically written.

3) The reflective layer 103 is used for improving the spectral reflectivity, facilitating the reflection measurement of spectral information, and is made of a material with high reflectivity.

The optical disc physical storage medium structure adopts a single beam nano photoetching method, and a compressed diffraction limited focusing light spot 104 is obtained by adopting a shorter wavelength writing laser beam (which can adopt a semiconductor laser with 405nm or shorter wavelength output, or 355 nm and 266 nm solid laser output, or 248 nm, 193 nm and 157 nm output excimer laser and the like) and a focusing mode of a high numerical aperture objective lens, wherein the light beam acts on a writing recording layer to perform digital information writing 106, and acts on a fixed information recording point position 105 of the writing recording layer by moving the light beam to complete the whole process of digital information storage.

Second embodiment

As shown in fig. 2A, a structure of a physical storage medium of an optical disc based on dual-beam nanolithography is shown, which includes:

1) a protective layer 201 that allows the optical disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the optical disc;

2) the absorption modulation layer 202 is made of materials with absorption modulation characteristics, the absorption spectrum of the material has the characteristics shown in figure 1, the thickness of the layer is less than 500nm, and the materials of the absorption modulation layer comprise diarylethene, fulgide materials and azide materials;

3) a recording layer 203 for writing and recording information, which is characterized by being capable of being stably stored and being optically written;

4) the reflective layer 204 is used to improve the spectral reflectivity, and is easy to measure the reflectivity of the spectral information, and it is made of a material with high reflectivity.

In another embodiment, as shown in fig. 2B, a transition protection layer of 10nm or less may be added between the absorption modulation layer 202 and the writing recording layer 203 as required to prevent the absorption modulation layer 202 from affecting the writing recording layer 203. The transition protective layer comprises the following materials: PVA (polyvinyl alcohol), PMMA (polymethyl methacrylate), and the like.

The structure of the optical disk physical storage medium adopts a double-beam nano photoetching method, and the following explains the double-beam photoetching information writing principle based on the mode in combination with fig. 2A and fig. 2B:

the solid writing beam 205 and the hollow suppressing beam 206 act on the absorption modulation layer 202 simultaneously, and the hollow suppressing beam 206 suppresses the peripheral beam of the solid writing beam 205 from transmitting through the absorption modulation layer 202 by the absorption modulation characteristic, so that the size of the writing spot transmitted through the absorption modulation layer 202 is further compressed, as shown by 207, and the beam 210 compressed by the absorption modulation layer 202 acts on the writing recording layer 203 for writing information. The compressed solid writing beam 210 acts on the writing recording layer to perform digital information writing 206, and acts on the fixed information recording point position 211 of the writing recording layer through the moving beam to perform nano-photoetching information recording at the next fixed information recording point position; and repeating the steps until the information recording process on the recording layer is completed, thereby improving the information storage dimension and the storage capacity of the optical disc.

Here, a description is given to the above-described dual-beam lithography information writing method in some cases: the method using a beam of wavelengths lambda₁And a beam of wavelength lambda₂The absorption modulation layer of the optical disk physical storage medium is prevented from being irradiated by continuous laser, super-resolution nano-lithography writing is realized through the absorption modulation characteristics of the absorption modulation material, and focal spots of writing light beams penetrating through the absorption modulation layer are greatly compressed, so that nano-lithography information recording exceeding diffraction limit light spots is realized. The method has the following function characteristics: wavelength of λ₁Irradiating the absorption modulation material with an intensity such that the material has a wavelength λ₁The writing light is transparent; wavelength lambda₂By simultaneously irradiating the material with an intensity such that the material is at a wavelength λ₂The light beam of (2) produces strong absorption; focal planes of the two beams of light are overlapped in space, the writing light beam is a solid light beam, the light intensity accords with Gaussian intensity distribution, and the function of recording information is achieved; the inhibition light beam is a hollow light beam, the light intensity accords with the annular intensity distribution, the central intensity is approximately zero (the central intensity can be generated by a vortex phase plate or a spatial light modulator and the like), and the effect of inhibiting peripheral light spots of the writing light beam from transmitting through the absorption modulation layer is achieved; the writing beam compressed by the absorption modulation layer acts on the writing recording layer. The irradiation time and the beam intensity of the writing beam and the inhibition beam are respectively controlled, and the accurate control of the etching depth and the etching width of the writing recording layer can be realized. In the double-beam nano photoetching information writing method, the writing beam can be blue light or ultraviolet short-wavelength continuous laser.

Third embodiment

As shown in fig. 3A, a dual-beam multi-layer dielectric film reflective optical disc is shown, which comprises:

1) a protective layer 301 that allows the disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the disc;

2) an absorption modulation layer 302, which has absorption modulation characteristics, and an absorption spectrum of which has characteristics as shown in fig. 1, and the thickness of which is less than 500nm, and which is made of diarylethene, fulgide materials, and azide materials;

3) the writing recording layer 303 is used for writing and recording information, and is characterized by being capable of being stably stored and optically written, and the writing recording layer is made of materials including SiO2, GaF2, MgF2, organic glass, photosensitive materials and the like;

4) the reflective layer 304 is used to improve the spectral reflectivity and facilitate the reflective measurement of spectral information, and is made of a material with high reflectivity, mainly including a metal material or a multilayer Distributed Bragg Reflector (DBR) material.

The physical storage medium structure of the optical disk adopts the double-beam nano-photoetching method as described in the second embodiment to write digital information, and combines 2^mA bit digital information coding method, taking m-3 as an example, continuously writing different groove depths Z1, Z2 and Z3 at digital storage positions (1), (2) and (3) at a fixed position 305 of an information recording point on 303, wherein writing corresponding to (m) indicates that a digital code "1" is stored at the position, otherwise, the digital code "0" is stored, and different (m) corresponds to different bit numbers in 2m bit coding; at this point, the information recording at the fixed position 305 is completed, and then the mobile terminal moves to the next fixed position, and the above process is repeated to complete the digital information storage; and the rest is done in sequence to finish the whole process of digital information storage.

It should be noted that, for the optical disc physical storage media in the first embodiment and the second embodiment, the protection layer 301 is not necessary, and other layers may also be implemented separately in the absence of the protection layer 301.

As shown in fig. 3B, it is shown that the digital storage information of the dual-beam multi-layer dielectric film reflective optical disc is read by the reflection spectrum measurement reading method, and the light source 306 emits white light; the lens groups 307 and 308 perform collimation and beam expansion on the white light and converge the white light to the beam splitter 309; the beam splitter 309 splits the received white light and emits the split white light to the high power objective lens 310; the high power objective lens 310 focuses the received white light on the surface of the optical disc physical storage medium 311 to perform reflection measurement on the written recording layer thereof, and emits the collected measurement light signal; a single lens 312 converges the measurement light signal to a spectrometer 313; spectrometer 314 processes the received measured light signal and decodes data storage information therefrom.

Preferably, the light source is a halogen lamp, a tungsten lamp, a xenon lamp, a white L ED lamp, a band-pass filtered white light source or an ultraviolet L ED light source, the band-pass filtered white light source enables the measurement light spot to be compressed, and the ultraviolet L ED light source enables the measurement information recording point spacing and the track spacing to be further improved.

The conventional grating spectrometer adopts a mechanical rotation grating method, and is not suitable for high-speed reading and processing of data. In order to meet the requirements of optical disc reading on speed and sensitivity, the spectrometer 313 of this embodiment adopts a high-speed measurement spectrometer, which specifically includes: the optical dispersion element, the narrow-band integrated optical filter and the linear array detector; wherein the optical dispersion element splits the received measurement optical signal to spatially spread the reflected spectral information; the narrow-band integrated optical filter obtains light with a wavelength corresponding to the reflection spectrum information after the light is dispersed by the optical dispersion element; the linear array detector detects the light intensity of the light with each wavelength obtained by the narrow-band integrated optical filter to obtain the reflection spectrum information. Of course, in other specific applications, the spectrometer can perform fast spectral information measurement only in the mode of "optical dispersion element + linear array detector" or "integrated narrowband filter + linear array detector" according to the actual spectral measurement requirement.

Fourth embodiment

As shown in fig. 4A, a single beam multi-layer dielectric film reflective optical disc is shown, which comprises:

1) a protective layer 402 that allows the disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the disc;

2) a recording layer 403 for writing and recording information, the layer being characterized by stable storage and optical writing, and being made of selected material including SiO₂、GaF₂、MgF₂Organic glass, photosensitive materials, and the like;

3) the reflective layer 404 is used to improve the spectral reflectivity and facilitate the reflective measurement of the spectral information, and is made of a material with high reflectivity, mainly including a metal material or a multilayer Distributed Bragg Reflector (DBR) material.

As shown in fig. 4B, the right side of the figure shows an optimized structure of the physical storage medium of the optical disc for improving the resolution of the reflection spectrum measurement, which has the following structure:

1) a recording layer 408 for writing and recording information, characterized in that it can be stably stored and can be optically written, and the material selected comprises SiO₂、GaF₂、MgF₂Organic glass, photosensitive materials, and the like;

2) an intermediate layer 409 of high refractive index material with refractive index higher than that of the material for writing the recording layer 303 and low spectral absorption, the thickness of the material being smaller than the measurement wavelength, and the selected material including Al₂O₃、Si₃N₄、Nb₂O₅、Ta₂O₅And TiO₂Etc.;

3) the reflective layer 410 is used to improve the spectral reflectivity and facilitate the reflective measurement of spectral information, and is made of a material with high reflectivity, mainly including a metal material or a multilayer Distributed Bragg Reflector (DBR) material.

Fig. 4B shows reflection measurement spectrum information 411 and 412 corresponding to the physical storage medium of the optical disc without the intermediate layer (left side of the figure) and the physical storage medium of the optical disc with the intermediate layer added (right side of the figure). As is evident from the comparison 411 and 412, the optical disc storage physical medium with the added intermediate layer has a significantly improved spectral resolution:

(1) the "peak position" shift is more pronounced 412 than 411;

(2)412, the intensity change is more severe, the coded information can be distinguished in a smaller window, such as 360 nm-400 nm, and the possibility of reading the spectrum information by adopting an ultraviolet interval light source is provided;

(3) the peak-type differences of the corresponding reflection spectra between different digitally encoded information increase.

Therefore, by adding one or more intermediate layers, the resolving power of the spectrum can be greatly improved.

As shown in fig. 4C, another optical physical storage medium is shown, in which a writing recording layer 414 has completed writing of lithography information on a second surface (see the plane in contact with 415 in the figure) and a reflection layer 413 is added on a first surface (see the plane in contact with 413 in the figure).

The forming mode of the optical disk physical storage medium is as follows: after the optical writing of the writing recording layer 303 of the third embodiment, the absorption modulation layer 302 (including the transition layer) of the optical disc is cleaned by a chemical method such as ultrasonic, and the writing recording layer 303 is turned over by 180 degrees after cleaning, so as to form the writing recording layer 303 with the second surface under and the first surface on which the optical writing is completed as shown in fig. 4C, at this time, the second surface is disposed to overlap with the original reflective layer 304 (i.e. 413 in fig. 4C), the reflective layer 415 is newly plated on the first surface, and a medium cavity is formed between the reflective layer 415 and the reflective layer 413. The reflective layer 415 may be made of a metal material such as gold or silver, or a multilayer DBR material. The reflective layer 413 is also a protective layer for the optical disc.

The medium cavity structure ensures that the service life of the spectral information only depends on the service life of the writing recording layer, thereby realizing the permanent storage of the stored information and greatly improving the storage density and the storage capacity.

Fifth embodiment

As shown in fig. 5, a dual-beam super-resolution fluorescent dark-state optical disc is shown, which comprises:

1) the protective layer 501 enables the optical disc to withstand frequent use, fingerprints, scratches and dirt, and ensures the storage quality and data security of the optical disc;

2) an absorption modulation layer 502, the layer of material having absorption modulation characteristics, the absorption spectrum of which is characterized as shown in fig. 3A, the layer thickness being typically less than 500nm, the absorption modulation layer of material comprising: diarylethenes, fulgides and azides;

3) a fluorescent writing recording layer 503 for recording fluorescent dark state information, which is characterized by being stable in storage, having high fluorescent efficiency and stability, and being capable of performing optical nano information writing, and mainly comprising a commonly used fluorescent material, such as 8-hydroxyquinoline (AIQ-3), and a curing agent;

4) the base layer 504 is used to protect the storage structure of the physical medium of the optical disc.

As described in the second embodiment, when the compressed solid writing beam is used to write the nano information, after the information writing at the information recording point 505 is completed, the compressed solid writing beam acts on the next information recording point to write the fluorescent dark state information, and so on, until the information recording process on the fluorescent writing recording layer is completed, thereby improving the information storage dimension and storage capacity of the optical disc, wherein whether the nano information lithography corresponding to the binary storage numbers "0" and "1" is performed at the fixed information recording position or not is determined.

As shown in fig. 5B, a single-beam super-resolution fluorescent dark state optical disc is shown, which comprises:

1) the protective layer 506 enables the optical disc to withstand frequent use, fingerprints, scratches and dirt, and ensures the storage quality and data security of the optical disc;

2) a fluorescent writing recording layer 507 for recording fluorescent dark state information, which is characterized by being stable in storage, having high fluorescent efficiency and stability, and being capable of performing optical nano information writing, and mainly comprising a common fluorescent material, such as 8-hydroxyquinoline (AIQ-3), and a curing agent;

3) the base layer 508 is used to protect the storage structure of the physical medium of the optical disc.

As described in the first embodiment, when the compressed solid writing beam is used to write the nano information, after the information writing at the information recording point 509 is completed, the compressed solid writing beam is made to act on the next information recording point to write the fluorescent dark state information, and so on, until the information recording process on the fluorescent writing recording layer is completed, thereby improving the information storage dimension and storage capacity of the optical disc, wherein whether the nano information lithography corresponding to the binary storage numbers "0" and "1" is performed at the fixed information recording position or not.

Sixth embodiment

As shown in fig. 6, a single-beam multilayer super-resolution fluorescent dark state optical disc is shown, comprising:

1) a protective layer 601 which allows the optical disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the optical disc;

2)602 is a fluorescent writing recording layer 1 for recording the fluorescent dark state information of the first layer, the thickness of the layer is larger than 1/2 wavelength, the layer is characterized by stable storage, high fluorescence efficiency and stability, and optical writing, and mainly comprises common fluorescent materials, such as 8-hydroxyquinoline (AIQ-3) and curing agent;

3)603 is an intermediate transition layer 1, the thickness of which is less than 1/2 wavelengths, and is arranged between the fluorescence recording layer 1 and the fluorescence recording layer 2 for protecting information crosstalk between the fluorescence recording layers, and common materials include organic materials such as PVA;

4)604 is a fluorescent writing recording layer 2, which is used for recording the fluorescent dark state information of the first layer of information, the thickness of the layer is larger than 1/2 wavelengths, the layer of material can be the same as the fluorescent recording layer material 1, or fluorescent materials with other fluorescent wavelengths can be selected, and crosstalk of signals can be effectively avoided by adopting multi-wavelength fluorescence for storage;

5)605 is an intermediate transition layer 2, the thickness of which is less than 1/2 wavelengths, and is arranged between the fluorescence recording layer 1 and the fluorescence recording layer 2 for protecting the information crosstalk between the fluorescence recording layers, and common materials comprise organic materials such as PVA;

6)606 is a fluorescent writing recording layer 3, used for recording the fluorescent dark state information of the first layer of information, the thickness of the layer is greater than 1/2 wavelengths, the layer of material can be the same as the materials 1, 2 of the fluorescent recording layer, or the fluorescent material with other fluorescent wavelengths can be selected, and the crosstalk of signals can be effectively improved by adopting multi-wavelength fluorescence for storage;

7)607 is the intermediate transition layer 3, the thickness of the layer is less than 1/2 wavelength, between the fluorescence recording layer 3 and the substrate, for protecting the information crosstalk between the fluorescence recording layer and the substrate, the common materials include organic materials such as PVA;

8) the base layer 608 is used to protect the physical media storage structure of the optical disc.

In combination with the physical storage structure of the optical disc, the following describes an improved method of writing information based on the single-beam lithography method in the second mode:

the focused light beam is focused 602 by the objective lens 609 and applied to the fluorescent writing recording layer 1, and writing of fluorescent dark state information is performed at an information recording spot (e.g. 612) on the fluorescent writing recording layer 1. When in writing, the writing control information at the information recording point is read, so as to judge whether to write the fluorescent dark state information, namely whether to perform photoetching writing. If the writing control information is '1' digit, writing is performed at the information recording point, and if the writing control information is '0', writing is not performed at the information recording point. After the information writing at the information recording point is finished, the light beam is made to act on the next information recording point of the current layer to write the fluorescent dark state information, and so on until the information recording process on the fluorescent writing recording layer 1 is finished.

By moving the position distance 609 between the objective lens and the sample or adjusting the laser divergence of the focused light beam, the focal depth of the light beam is adjusted (process 610), so that the focused light beam acts 604 on the fluorescent writing recording layer 2, when writing and writing of fluorescent dark state information are performed at an information recording point (e.g. 613) on the fluorescent writing recording layer 2, writing control information at the information recording point is read, and whether writing of fluorescent dark state information is performed, that is, whether photolithography writing is performed is determined. If the writing control information is '1' digit, writing is performed at the information recording point, and if the writing control information is '0', writing is not performed at the information recording point. After finishing writing the information at the information recording point, the light beam is made to act on the next information recording point of the current layer to write the fluorescent dark state information, and so on until finishing the information recording process on the fluorescent writing recording layer 2.

The focal depth of the focused light beam is adjusted by moving the positional distance 609 between the objective lens and the sample or adjusting the laser divergence of the focused light beam (process 611) so that the focused light beam acts 606 on the fluorescent-write recording layer 3 to write fluorescent dark-state information at an information recording spot (e.g., 614) on the fluorescent-write recording layer 3. If the writing control information is '1' digit, writing is performed at the information recording point, and if the writing control information is '0', writing is not performed at the information recording point. After finishing writing the information at the information recording point, the light beam is made to act on the next information recording point of the current layer to write the fluorescent dark state information, and so on until finishing the information recording process on the fluorescent writing recording layer 3.

In order to avoid the crosstalk problem of multilayer fluorescent signals, the solid writing light beam adopts a pulse light beam, the two-photon characteristic of the material is utilized, and the signal crosstalk problem in the writing process is avoided through the threshold characteristic of the two-photon process. Meanwhile, a compressed diffraction-limited focusing spot is obtained by using a shorter-wavelength writing laser beam (semiconductor laser with 405nm or shorter wavelength output, or 355 nm and 266 nm solid laser output, or 248 nm, 193 nm and 157 nm excimer laser output and the like) and a focusing mode of a high-numerical-aperture objective lens.

Seventh embodiment

Fig. 7 shows a dual-beam multi-layer super-resolution fluorescent dark state optical disc, comprising:

1) a protective layer 701 that allows the optical disc to withstand frequent use, fingerprints, scratches, and dirt, thereby ensuring the storage quality and data security of the optical disc;

2) reference numeral 702 denotes an absorption modulation layer 1, which has absorption modulation characteristics, the absorption spectrum of which is shown in fig. 3A, the layer thickness is generally less than 500nm, the layer compresses the writing pulse beam gaussian-linearly, the compressed beam acts on the fluorescent recording layer 1 for the fluorescent dark state information writing process, and the absorption modulation layer material includes: diarylethenes, fulgides and azides;

3)703 is a fluorescent writing recording layer 1 for recording the fluorescent dark state information of the first layer, the layer has a thickness of more than 1/2 wavelengths, and is characterized by stable storage, high fluorescence efficiency and stability, and optical writing, and is mainly composed of common fluorescent materials, such as 8-hydroxyquinoline (AIQ-3) and curing agent;

4)704 is an absorption modulation layer 2, the layer has absorption modulation characteristics, the absorption spectrum of the layer is shown in fig. 3A, the layer thickness is less than 500nm, the layer compresses writing pulse beams in Gaussian linearity, the compressed beams act on the fluorescent recording layer 2 for fluorescent dark state writing process, the absorption modulation layer material comprises diaryl ethylene, fulgide and azide materials;

5)705 is a fluorescent writing recording layer 2 for recording the fluorescent dark state information of the second layer information, the thickness of the layer is larger than 1/2 wavelengths, the material of the layer can be the same as that of the fluorescent recording layer 1, or fluorescent materials with other fluorescent wavelengths can be selected, and crosstalk of signals can be effectively improved by adopting multi-wavelength fluorescence for storage;

6) and 706 is an absorption modulation layer 3, which has absorption modulation characteristics, the absorption spectrum of which is shown in fig. 3A, the layer thickness is less than 500nm, the layer compresses the writing pulse beam gaussian linearity, the compressed beam acts on the fluorescent recording layer 3 for the fluorescent dark state information writing process, and the absorption modulation layer material includes: diarylethenes, fulgides and azides;

7)707, a fluorescent writing recording layer 3, for recording the fluorescent dark state information of the third layer of information, the thickness of the layer is greater than 1/2 wavelengths, the material of the layer may be the same as that of the fluorescent recording layers 1 and 2, or fluorescent materials with other fluorescent wavelengths may be selected, and crosstalk of signals may be effectively improved by storing with multi-wavelength fluorescence;

8)708 is an intermediate transition layer with a thickness less than 1/2 wavelength, which is disposed between the fluorescence recording layer 3 and the substrate for protecting the information crosstalk between the fluorescence recording layer and the substrate, and the commonly used materials include organic materials such as PVA;

8) the base layer 709 is used for protecting the storage structure of the physical medium of the optical disc.

With reference to the physical storage structure of the optical disc, the following describes an improved method of the dual-beam lithography information writing method based on the first mode:

the solid writing light beam 711 and the hollow inhibiting light beam 712 are focused by the objective lens 710 to act on the absorption modulation layer 1 of 702, and are focused by the absorption modulation layer 1, and the laser beam 713 passing through the absorption modulation layer is focused to act on the fluorescent writing recording layer 1 of 703, so that the fluorescent dark state information writing process, i.e. whether the photoetching writing is performed, is performed at the information recording point (for example, 714) on the fluorescent writing recording layer 1. If the writing control information is '1' digit, writing is performed at the information recording point, and if the writing control information is '0', writing is not performed at the information recording point. After the information writing at the information recording point is finished, the light beam is made to act on the next information recording point of the current layer to write the fluorescent dark state information, and so on until the information recording process on the fluorescent writing recording layer 1 is finished.

The intensity and divergence of the solid writing beam 711 and the hollow suppression beam 412 and the position distance between the objective lens and the sample are adjusted (process 715), so that the laser beam transmitted through the absorption modulation layer is focused on 704 the absorption modulation layer 2, the laser beam transmitted through the absorption modulation layer is focused on 705 the fluorescent writing recording layer 2, and the fluorescent dark state information writing process, i.e. whether the photoetching writing is carried out, is carried out at the information recording point (e.g. 716) on the fluorescent writing recording layer 2. If the writing control information is '1' digit, writing is performed at the information recording point, and if the writing control information is '0', writing is not performed at the information recording point. After finishing writing the information at the information recording point, the light beam is made to act on the next information recording point of the current layer to write the fluorescent dark state information, and so on until finishing the information recording process on the fluorescent writing recording layer 2.

The intensity and divergence of the solid writing beam 711 and the hollow suppression beam 712 and the positional distance between the objective lens and the sample are adjusted (process 717), so that the laser beam transmitted through the absorption modulation layer is focused 706 on the absorption modulation layer 3, the laser beam transmitted through the absorption modulation layer is focused 707 on the fluorescent writing recording layer 3, and the fluorescent dark state information writing process, i.e. whether the optical writing is performed, is performed at the information recording point (e.g. 718) on the fluorescent writing recording layer 3. If the writing control information is '1' digit, writing is performed at the information recording point, and if the writing control information is '0', writing is not performed at the information recording point. After finishing writing the information at the information recording point, the light beam is made to act on the next information recording point of the current layer to write the fluorescent dark state information, and so on until finishing the information recording process on the fluorescent writing recording layer 3.

In order to avoid the crosstalk problem of the multilayer fluorescent signal, the solid writing beam 711 adopts a pulse beam, utilizes the two-photon characteristics of the material, avoids the signal crosstalk problem in the writing process through the threshold characteristics of the two-photon nanometer information writing process, and can realize the multilayer digital information writing of the optical disc.

Eighth embodiment

As shown in fig. 8, a super-resolution fluorescent dark state reading method for a multi-layer super-resolution fluorescent dark state optical disc is shown, in which 801 is a protective layer, 802 is a fluorescent writing recording layer 1, 804 is a fluorescent writing recording layer 2, 806 is a fluorescent writing recording layer 3, 803, 805, 807 are intermediate transition layers, and 808 is a substrate layer.

1) For the structure of the multi-layer optical disc storage medium after writing, laser beams 810 and 811 are focused by an objective lens 809 to act on the 802 fluorescent recording layer 1, and a fluorescent signal of the layer is read;

2) the laser beam 810 is a solid beam, the light intensity accords with Gaussian intensity distribution, so that the fluorescent material generates fluorescence, the laser beam 811 is a hollow beam, the light intensity accords with annular intensity distribution, the central intensity is approximately zero (the central intensity can be generated by a vortex phase plate or a spatial light modulator and the like), the effect of inhibiting the fluorescent material from generating fluorescence is achieved, the effect of erasing the fluorescence is achieved, and the super-resolution reading of the fluorescence is achieved;

3) performing super-resolution reading process of fluorescent signal at information recording point (such as 814) on the fluorescent writing recording layer 1, indicating that the point is stored with dark state information when the corresponding fluorescent intensity is low, and decoding to obtain recording information of the point as "1"; when the corresponding fluorescence intensity is higher, the dark state information is not stored at the point, and the recorded information of the point is decoded to be 0; completing the information reading process at the information recording point, moving the optical disk storage medium structure, and enabling the light beam to act on the next information recording point of the fluorescent writing recording layer 1 to read the fluorescent dark state information, and repeating the above steps until the information reading process on the fluorescent writing recording layer 1 is completed;

4) moving the objective lens position (process 812), so that the light beams 810 and 811 are focused on 504 the fluorescent writing recording layer 2, performing a super-resolution reading process of a fluorescent signal at an information recording point (e.g. 815) on the fluorescent writing recording layer 2, indicating that dark state information is stored at the point when the corresponding fluorescent intensity is low, and decoding the recording information of the point to be '1'; when the corresponding fluorescence intensity is higher, the dark state information is not stored at the point, and the recorded information of the point is decoded to be 0; completing the information reading process at the information recording point, moving the optical disk storage medium structure, and enabling the light beam to act on the next information recording point of the fluorescent writing recording layer 2 to read the fluorescent dark state information, and repeating the above steps until the information reading process on the fluorescent writing recording layer 2 is completed;

5) moving the objective lens (process 813) to focus the light beams 810 and 811 on 806 the fluorescent writing recording layer 3, performing a super-resolution reading process of the fluorescent signal at the information recording point (e.g. 816) on the fluorescent writing recording layer 3, indicating that the dark state information is stored at the information recording point when the corresponding fluorescent intensity is lower, and decoding the recorded information of the point to be "1"; when the corresponding fluorescence intensity is higher, the dark state information is not stored at the point, and the recorded information of the point is decoded to be 0; and finishing the information reading process at the information recording point, moving the optical disk storage medium structure, and enabling the light beam to act on the next information recording point of the fluorescent writing recording layer 3 to read the fluorescent dark state information, and repeating the steps until the information reading process on the fluorescent writing recording layer 3 is finished.

It should be noted that the super-resolution fluorescent dark state reading method adopts a confocal chromatography type reading mode to realize the reading of the multilayer storage information of the physical storage medium of the optical disc, and the method can also be used for the reading of the digital information of the single-layer super-resolution fluorescent dark state optical disc.

Ninth embodiment

As shown in fig. 9A, there is shown a dual beam birefringent polarizing optical disc comprising:

1) a protective layer 901, which allows the optical disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the optical disc;

2) an absorption modulation layer 902, the layer of material having absorption modulation characteristics, the absorption spectrum of which has the characteristics as shown in fig. 1, the layer thickness being less than 500nm, the absorption modulation layer of material comprising diarylethenes, fulgides, azides;

3) a write recording layer 903 for writing and recording information, which is characterized by being stably storable and capable of optical writing;

4) the reflective layer 904 is used to improve the spectral reflectivity and facilitate the reflective measurement of spectral information, and is made of a material with high reflectivity, mainly including a metal material or a multilayer Distributed Bragg Reflector (DBR) material.

The optical film-forming birefringent material for the writing recording layer 903 can be any one or more of the following materials:

1) the film polarization material formed by the dielectric film stack adopts materials including MgF2, SiO2, ZrO2, TiO2 or HfO2 by a physical vapor deposition method;

2) an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material;

3) a birefringent sculpturing film, the film material comprising SiO2, TiO2, or ZnS;

4) a birefringent crystalline material comprising calcite, lithium niobate, lithium tantalate, or barium niobate.

For an erasable optical disc, i.e. an optical disc based on the optical birefringence effect reading method, the writing recording layer 903 may be an optical film-forming optical birefringence material, which includes:

1) an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material;

2) and the metal ion doped lithium niobate crystal material comprises ferromanganese double doping, Mg or Fe.

The structure of the physical storage medium of the optical disc adopts the double-beam nano-lithography method as described in the second embodiment to write digital information, in combination with 2^mA bit digital information coding method, taking m as an example 3, continuously writing different groove depths Z1, Z2 and Z3 at digital storage positions (1), (2) and (3) at a fixed position 905 of an information recording point on 903, wherein writing at a corresponding position (m) indicates that a digital code "1" is stored at the position, otherwise, the digital code "0" is stored, and different positions (m) correspond to different bit numbers in 2m bit coding; at this point, information recording at the position 905 is finished, the mobile terminal moves to the next fixed position, and the process is repeated to finish digital information storage; and the rest is done in sequence to finish the whole process of digital information storage.

As shown in fig. 9B, a single beam birefringent polarizing optical disc is shown, comprising:

1) a protective layer 906 that allows the disc to withstand frequent use, fingerprints, scratches and dirt, thereby ensuring the storage quality and data security of the disc;

2) a write recording layer 907 for writing and recording information, which is characterized by being stably storable and capable of optical writing;

3) the reflective layer 908 is used to improve the spectral reflectivity and facilitate the reflective measurement of spectral information, and is made of a material with high reflectivity, mainly including a metal material or a multilayer Distributed Bragg Reflector (DBR) material.

The optical film-forming birefringent material for writing the recording layer 907 may include any one or more of the following materials:

1) the film polarization material formed by the dielectric film stack adopts materials including MgF2, SiO2, ZrO2, TiO2 or HfO2 by a physical vapor deposition method;

2) an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material;

3) a birefringent sculpturing film, the film material comprising SiO2, TiO2, or ZnS;

4) a birefringent crystalline material comprising calcite, lithium niobate, lithium tantalate, or barium niobate;

5) the optical rotation material, the polarization plane of which changes when light passes through the material, comprises quartz and any one or combination of more of optical rotation high molecular polymers.

It should be noted that, for the erasable optical disc, i.e. the optical disc based on the optical disc readout method of the optical birefringence effect, the writing recording layer 907 can be an optical film-forming optical birefringence material, which includes:

1) an organic polymer material including an azo polymer, an azo liquid crystal material, PMMA, PE, PI, or a polyester material;

2) and the metal ion doped lithium niobate crystal material comprises ferromanganese double doping, Mg or Fe.

The physical storage medium structure of the optical disc adopts the single-beam nanolithography method as described in the second embodiment for digital information writing, in combination with 2^mA bit digital information coding method, taking m-3 as an example, continuously writing different groove depths Z1, Z2 and Z3 at digital storage sites (1), (2) and (3) at fixed positions 909 of an information recording point on 907, wherein writing at the corresponding position (m) indicates that a digital code "1" is stored at the position, otherwise, the digital code "0" is stored, and different positions (m) correspond to different bit numbers in 2m bit coding; at this point, the information recording at 909 is completed, and then the mobile terminal moves to the next fixed position, and the above processes are repeated to complete the digital information storage; and the rest is done in sequence to finish the whole process of digital information storage.

Tenth embodiment

The optical disc physical storage media described in the first to ninth embodiments can be regarded as a "single-sided" structure. The embodiment provides a double-sided optical disc physical storage medium, thereby achieving the effect of double-sided high-density information storage. The so-called "double-sided" structure can be viewed as being formed by two "single-sided" structures sharing a reflective layer 103 or reflective layer 204 disposed "back-to-back". In this embodiment, the reflective layer 103 in the first embodiment or the reflective layer 204 in the second embodiment serves as a base layer, and the other layers are symmetrically disposed on the upper surface and the lower surface of the base layer. For example, taking the optical disc physical storage medium described in the first embodiment as an example, the structure of the optical disc physical storage medium extended to the double-sided structure is a protection layer, a recording layer, a reflection layer, a recording layer, and a protection layer from top to bottom.

The application also provides a writing and reading method based on the nano photoetching optical disk, which selects different optical disk physical storage medium structures according to different photoetching information writing methods, and comprises the following steps: selecting a physical storage medium structure of the dual-beam optical disc according to a dual-beam nano photoetching information writing method; selecting a physical storage medium structure of the single-beam optical disc according to a single-beam nanolithography information writing method; the physical storage medium structure of the double-beam optical disc and the physical storage medium structure of the single-beam optical disc are both multilayer structures. Since the embodiment of the writing and reading method based on the nano-lithography disc in this embodiment is similar to the above embodiment of the physical storage medium structure based on the nano-lithography disc, further description is omitted.

The present application also provides a nanolithography-based optical disc comprising the physical storage media structure. Since the embodiment of the optical disc based on nano lithography in this embodiment is similar to the above embodiment of the physical storage medium structure based on nano lithography, further description is omitted.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.