阅读说明：本技术 一种基于倏逝场的光纤忆阻单元 (Optical fiber memristor unit based on evanescent field ) 是由 金威 李翔 程思莹 李亚茹 张毅博 张亚勋 张羽 刘志海 杨军 苑立波 于 2021-09-01 设计创作，主要内容包括：本发明提供了一种基于倏逝场的光纤忆阻单元。该基于倏逝场的光纤忆阻单元,包括单模光纤、光学相变材料薄膜和防氧化薄膜。其中,光学相变材料薄膜位于单模光纤侧面凹槽,在光学相变材料薄膜上方镀有防氧化薄膜。在该光纤忆阻单元中,纤芯中注入脉冲光通过倏逝场耦合至光纤相变材料薄膜上,实现其相态的调控,使得光纤忆阻单元的透射率发生变化,完成非易失性全光存储。该单模光纤忆阻单元可以作为一种光脉冲调控的光纤存储器件,其存储速率高、能耗低以及抗电磁干扰等,能良好的与当前光纤系统兼容,具备极大的应用潜力。(The invention provides an optical fiber memristor unit based on an evanescent field. The optical fiber memristor unit based on the evanescent field comprises a single-mode optical fiber, an optical phase change material film and an anti-oxidation film. The optical phase-change material film is positioned in a groove on the side surface of the single-mode optical fiber, and an anti-oxidation film is plated above the optical phase-change material film. In the optical fiber memristor unit, pulsed light injected into a fiber core is coupled to the optical fiber phase change material film through an evanescent field, so that the phase state of the optical fiber memristor unit is regulated, the transmissivity of the optical fiber memristor unit is changed, and the nonvolatile all-optical storage is completed. The single-mode optical fiber memristor unit can be used as an optical fiber storage device regulated and controlled by light pulses, is high in storage rate, low in energy consumption, resistant to electromagnetic interference and the like, can be well compatible with a current optical fiber system, and has great application potential.)

1. An optical fiber memristor unit based on an evanescent field comprises a single-mode optical fiber (1), an optical phase-change material film (2), an anti-oxidation film (3) and a side groove (4);

a lateral groove (4) of the single-mode optical fiber (1) is plated with an optical phase-change material film (2), and an anti-oxidation film (3) is plated above the optical phase-change material film (2);

the optical phase-change material film (2) is made of a chalcogenide compound, specifically a germanium-antimony-tellurium alloy (Ge)₂Sb₂Te₅) Silver indium antimony tellurium alloy (AgInSbTe), and the like;

the optical phase-change material film (2) has at least two phase states, namely a crystalline state and an amorphous state, the absorptivity of the two phase states in a communication waveband is different, the absorptivity of the crystalline state is high, and the absorptivity of the amorphous state is low;

the optical phase-change material film (2) is combined with the bottom of the side groove (4) in the single-mode optical fiber (1) in a radio frequency magnetron sputtering mode, and the thickness of the optical phase-change material film is 10 nm;

the material of the anti-oxidation film (3) is Indium Tin Oxide (ITO) and the like;

the anti-oxidation film (3) prevents the optical phase change material film (2) from being exposed in the air and oxidized;

the anti-oxidation film (3) is combined with the optical phase change material film (2) in a radio frequency magnetron sputtering mode, and the thickness of the anti-oxidation film is 10 nm;

the side groove (4) is processed by a single-mode fiber (1) through femtosecond laser to form a groove structure, the bottom of the groove is 2-5 mu m away from the fiber core, the axial length of the groove is 10 mu m, and the transverse length of the groove is 5 mu m;

the optical fiber memristor unit based on the evanescent field is erased and written by pulse laser of a communication waveband with larger peak power, the pulse laser is coupled with the optical phase change material film (2) through the evanescent field to regulate and control the phase state of the optical phase change material film (2), and the optical phase change material film is switched from a crystalline state to an amorphous state;

according to the optical fiber memristor unit based on the evanescent field, continuous laser with relatively low power in a communication waveband is used for reading the transmissivity of the optical fiber memristor unit, when the optical phase-change material film (2) is in a crystalline state, the absorptivity is high, and the continuous laser emitted by the optical fiber memristor unit is in a low state; when the optical phase-change material film (2) is in an amorphous state, the absorptivity is low, and continuous laser emitted by the optical fiber memristor unit is in a high state; when the optical phase-change material film (2) is between the crystalline state and the amorphous state, continuous laser emitted by the optical fiber memristor unit is in an intermediate state, and the stored order is represented.

The technical field is as follows:

the invention belongs to the technical field of optical information, and particularly relates to an optical fiber memristor unit based on an evanescent field.

Background art:

in the field of optical disc information storage, the optical means for reading and writing are used to complete the technology, and the development speed of the technology is slowed down due to the appearance of the electronic flash memory technology. While the storage media of the electronic flash memory technology are highly integrated and have high storage capacity per unit space, with the coming of moore's law limit, electronic-based storage elements will be challenged, and therefore the development of the storage technology of optical means is inevitable.

In the existing optical storage technology, the operation of reading is mostly realized by optical means (F.A.quinlan inner Yufu, M.P.C.M.Crijjen. optical transmission type information storage unit [ P ]. Netherlands: CN106104694B,2019-03-26.), and the operation of writing is still realized by electrical means; furthermore, the optical storage means still mainly uses the optical disc information storage technology (zoomingqing, huang mao, gui yu sanden. optical storage device, control chip and driving method of optical head [ P ]. taiwan:

CN101650949,2010-02-17.). Therefore, it is important to find an all-optical storage technology adapted to the current optical technology, and the optical fiber as the current world main communication carrier has mature information transmission and information perception functions, so that a new technical breakthrough is urgently to be generated, and the all-optical storage technology based on the optical fiber becomes a necessary trend for development.

The invention content is as follows:

the invention aims to provide an optical fiber memristor unit based on an evanescent field, and non-volatile all-optical storage on an optical fiber is realized.

An optical fiber memristor unit based on an evanescent field comprises a single-mode optical fiber (1), an optical phase-change material film (2), an anti-oxidation film (3) and a side groove (4);

a lateral groove (4) of the single-mode optical fiber (1) is plated with an optical phase-change material film (2), and an anti-oxidation film (3) is plated above the optical phase-change material film (2);

the optical phase-change material film (2) is made of a chalcogenide compound, specifically a germanium-antimony-tellurium alloy (Ge)₂Sb₂Te₅) Silver indium antimony tellurium alloy (AgInSbTe), and the like;

the optical phase-change material film (2) has at least two phase states, namely a crystalline state and an amorphous state, the absorptivity of the two phase states in a communication waveband is different, the absorptivity of the crystalline state is high, and the absorptivity of the amorphous state is low;

the optical phase-change material film (2) is combined with the bottom of the side groove (4) in the single-mode optical fiber (1) in a radio frequency magnetron sputtering mode, and the thickness of the optical phase-change material film is 10 nm;

the material of the anti-oxidation film (3) is Indium Tin Oxide (ITO) and the like;

the anti-oxidation film (3) prevents the optical phase change material film (2) from being exposed in the air and oxidized;

the anti-oxidation film (3) is combined with the optical phase change material film (2) in a radio frequency magnetron sputtering mode, and the thickness of the anti-oxidation film is 10 nm;

the side groove (4) is processed by a single-mode fiber (1) through femtosecond laser to form a groove structure, the bottom of the groove is 2-5 mu m away from the fiber core, the axial length of the groove is 10 mu m, and the transverse length of the groove is 5 mu m;

the optical fiber memristor unit based on the evanescent field is erased and written by pulse laser of a communication waveband with larger peak power, the pulse laser is coupled with the optical phase change material film (2) through the evanescent field to regulate and control the phase state of the optical phase change material film (2), and the optical phase change material film is switched from a crystalline state to an amorphous state;

according to the optical fiber memristor unit based on the evanescent field, continuous laser with relatively low power in a communication waveband is used for reading the transmissivity of the optical fiber memristor unit, when the optical phase-change material film (2) is in a crystalline state, the absorptivity is high, and the continuous laser emitted by the optical fiber memristor unit is in a low state; when the optical phase-change material film (2) is in an amorphous state, the absorptivity is low, and continuous laser emitted by the optical fiber memristor unit is in a high state; when the optical phase-change material film (2) is between the crystalline state and the amorphous state, continuous laser emitted by the optical fiber memristor unit is in an intermediate state, and the stored order is represented.

The invention has the beneficial effects that:

the invention brings brand new functions to the existing optical fiber technology, realizes the memory cell structure on the optical fiber by all-optical means, realizes the erasing and writing and reading operations by photons, and realizes the nonvolatile memory function. The storage process of the invention is realized by taking photons as a medium, and compared with an electronic means, the storage process has the advantages of higher regulation and control speed, lower energy consumption and strong anti-interference capability, and is expected to be widely applied.

Description of the drawings:

fig. 1 is a schematic diagram of an optical fiber memristor unit provided by the present invention.

FIG. 2 is a diagram of a regulation optical path of an optical fiber memristor unit in the present invention.

FIG. 3 is a schematic diagram of a nonvolatile multi-level memory of a fiber memristive cell in the present disclosure.

The specific implementation mode is as follows:

for clearly illustrating the optical fiber memristive cell based on the evanescent field, the present invention is further described with reference to the embodiments and the drawings, but the scope of the present invention should not be limited thereby.

The invention aims to provide an optical fiber memristor unit based on an evanescent field, and non-volatile all-optical storage on an optical fiber is realized. Referring to fig. 1, fig. 1 is a schematic diagram of an optical fiber memristive cell based on an evanescent field according to the present invention.

An optical fiber memristor unit based on an evanescent field comprises a single-mode optical fiber (1), an optical phase-change material film (2), an anti-oxidation film (3) and a side groove (4).

The optical fiber comprises a single-mode optical fiber (1), wherein a side groove (4) of the single-mode optical fiber (1) is plated with an optical phase-change material film (2), and an anti-oxidation film (3) is plated above the optical phase-change material film (2).

Wherein the optical phase-change material film (2) is made of chalcogenide, specifically germanium-antimony-tellurium alloy (Ge)₂Sb₂Te₅) Silver indium antimony tellurium alloy (AgInSbTe), and the like; the optical phase-change material film (2) has at least two phase states, namely a crystalline state and an amorphous state, the two phase states have different absorptivity in a communication waveband, the absorptivity of the crystalline state is high, and the absorptivity of the amorphous state is low; the optical phase-change material film (2) is combined with the bottom of the side groove (4) in the single-mode optical fiber (1) in a radio frequency magnetron sputtering mode, and the thickness of the optical phase-change material film is 10 nm.

Wherein, the material of the anti-oxidation film (3) is Indium Tin Oxide (ITO) and the like; the anti-oxidation film (3) prevents the optical phase change material film (2) from being exposed to air and oxidized; the anti-oxidation film (3) is combined with the optical phase change material film (2) in a radio frequency magnetron sputtering mode, and the thickness of the anti-oxidation film is 10 nm.

The side groove (4) is processed by a single-mode fiber (1) through femtosecond laser to form a groove structure, the distance from the bottom of the groove to the fiber core is 2-5 mu m, the axial length of the groove is 10 mu m, and the transverse length of the groove is 5 mu m.

The optical fiber memristor unit based on the evanescent field is erased and written by pulse laser of a communication waveband with larger peak power, the pulse laser is coupled with the optical phase-change material film (2) through the evanescent field to regulate and control the phase state of the optical phase-change material film (2), and the optical phase-change material film is switched from a crystalline state to an amorphous state;

on the basis of the optical fiber memristor unit in the evanescent field, continuous laser with a communication waveband with weak power is used for reading the transmissivity of the optical fiber memristor unit, when the optical phase-change material film (2) is in a crystalline state, the absorptivity is high, and the continuous laser emitted by the optical fiber memristor unit is in a low state; when the optical phase-change material film (2) is in an amorphous state, the absorptivity is low, and continuous laser emitted by the optical fiber memristor unit is in a high state; when the optical phase-change material film (2) is between the crystalline state and the amorphous state, continuous laser emitted by the optical fiber memristor unit is in an intermediate state, and the stored order is represented.

Referring to fig. 2, fig. 2 is a diagram of a modulation optical path of an optical fiber memristive cell based on an evanescent field according to an embodiment of the present invention.

The adjusting and controlling light path diagram of the optical fiber memristor unit based on the evanescent field comprises a pulse laser (5), a continuous laser (6), a coupler (7), an optical fiber memristor unit (8), an optical filter (9), a photoelectric detector (10) and a signal processing system (11).

The high-power pulse laser is emitted by the pulse laser (5), enters the optical fiber memristor unit (8) through the coupler (6), and is isolated by the optical filter (9); the energy of high-power pulse laser emitted by the pulse laser (5) is concentrated, and the phase state of the optical phase change material (2) in the optical fiber memristor unit (8) can be caused to be changed, namely, erasing operation; through regulating and controlling parameters such as pulse laser peak power, pulse width, repetition frequency and the like emitted by the pulse laser (5), the multi-phase regulation and control of the optical fiber memristor unit (8) can be realized.

The continuous laser (5) emits low-power continuous laser, the low-power continuous laser is incident into the optical fiber memristor unit (8) through the coupler (6), then the low-power continuous laser passes through the optical filter (9), is received by the photoelectric detector (10), converts an optical signal into an electric signal and outputs the electric signal to the signal processing system (11); the continuous laser (5) emits low-power continuous laser light to 'read' the transmissivity (in the state) of the optical fiber memristive cell (8), and when the optical fiber memristive cell (8) is in different phase states, the reflectivity of the optical fiber memristive cell to the light is different.

The signal processing system (11) receives the information of the laser read by the photoelectric detector (10), and controls the pulse laser (5) and the continuous laser (6) to regulate and control the parameters of the pulse laser emitted by the pulse laser (5) and the parameters of the continuous laser emitted by the continuous laser (6).

The full-optical nonvolatile multilevel storage can be realized by the optical fiber memristor unit regulation optical path diagram based on the evanescent field. Referring to fig. 3, fig. 3 is a schematic diagram of a nonvolatile multi-level memory of a fiber memristive cell.

The non-volatile multi-level storage schematic diagram of the optical fiber memristor unit based on the evanescent field is a representation that the optical fiber memristor unit (8) is regulated and controlled in a time domain, and the pulse laser (5) is used for erasing and writing operation to realize phase change; the 'reading' operation is carried out by a continuous laser (6) to realize the detection of the transmissivity; the transmissivity is switched from high order to zero order, and 7 high-order steps are switched to the zero order step; 8-level storage, namely 3 bits (3 bits), can be realized.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.