阅读说明：本技术 一种全光二级管器件 (All-optical diode device ) 是由 郭滨刚 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种全光二级管器件,包括第一波长选择性元件、第二波长选择性元件以及设置在第一波长选择性元件和第二波长选择性元件之间的频率转换层,频率转换层为频率转换元件或频率转换材料,所述第一波长选择性元件可透过第一波长光,反射第二波长光,所述第二波长选择性元件可反射第一波长光,透过第二波长光,所述频率转换层用于将第一波长光为第二波长光。本发明的结构能实现对光路的正向导通和反向截止,有高的正反向光信号传输的导通/截止强度比,且结构简单,易于集成,制作周期短,成本低、信号光源波长频率可选择、可调控。(The invention relates to an all-optical diode device which comprises a first wavelength selective element, a second wavelength selective element and a frequency conversion layer arranged between the first wavelength selective element and the second wavelength selective element, wherein the frequency conversion layer is a frequency conversion element or a frequency conversion material, the first wavelength selective element can transmit first wavelength light and reflect second wavelength light, the second wavelength selective element can reflect the first wavelength light and transmit the second wavelength light, and the frequency conversion layer is used for converting the first wavelength light into the second wavelength light. The structure of the invention can realize forward conduction and reverse cut-off of the optical path, has high on/cut-off intensity ratio of forward and reverse optical signal transmission, and has the advantages of simple structure, easy integration, short manufacturing period, low cost, selectable and adjustable wavelength frequency of the signal light source.)

1. An all-optical diode device, comprising: the wavelength conversion device comprises a first wavelength selective element, a second wavelength selective element and a frequency conversion layer arranged between the first wavelength selective element and the second wavelength selective element, wherein the frequency conversion layer is one of a frequency conversion element and a frequency conversion material, the first wavelength selective element can transmit first wavelength light and reflect second wavelength light, the second wavelength selective element can reflect the first wavelength light and transmit the second wavelength light, and the frequency conversion element is used for converting the first wavelength light into the second wavelength light.

2. The all-optical diode device of claim 1, wherein the first and second wavelength selective elements are one or more of one-dimensional photonic crystals, two-dimensional photonic crystals, three-dimensional photonic crystals, and band-pass filter optical films.

3. The all-optical diode device of claim 1, wherein: the frequency conversion element is a nonlinear optical crystal element, and the frequency conversion material is one or more of an up-conversion luminescent material and a down-conversion luminescent material.

4. The all-optical diode element according to any one of claims 1 to 3, characterized in that: the first wavelength selective device and the second wavelength selective device are both provided with substrates, and the first wavelength selective device and the second wavelength selective device are attached to the substrates.

5. The all-optical diode element of claim 4, wherein: the substrate is made of high-temperature-resistant organic glass or plastic.

6. The all-optical diode element of claim 4, wherein: the surface of the substrate contacted with the wavelength selector has finish IV grade and light transmittance of more than 93 percent.

Technical Field

The invention relates to an all-optical diode device.

Background

The all-optical diode is an integrated photonic device capable of realizing unidirectional conduction and reverse cut-off of optical signals, realizes functions of unidirectional conduction, reverse cut-off, conduction characteristic regulation and control and the like of signal light beams by completely utilizing the interaction of light and substances, is one of core devices for constructing an integrated photonic circuit and realizing optical signal regulation and control and optical calculation, and has very important application backgrounds in the fields of optical communication, optical interconnection networks, ultra-fast information processing and the like. How to effectively enhance the performances of the all-optical diode, such as one-way transmittance, optical isolation, wavelength conversion range, and the like, is a key point of research of researchers.

Disclosure of Invention

The present invention is directed to solve the disadvantages of the prior art, and therefore, an all-optical diode device is provided, which includes a first wavelength selective element, a second wavelength selective element, and a frequency conversion layer disposed between the first wavelength selective element and the second wavelength selective element, where the frequency conversion layer is one of a frequency conversion element and a frequency conversion material, the first wavelength selective element is transparent to light with a first wavelength and reflects light with a second wavelength, the second wavelength selective element is reflective to light with the first wavelength and transmits light with the second wavelength, and the frequency conversion element is configured to convert light with the first wavelength into light with the second wavelength.

Further, the first wavelength selective element and the second wavelength selective element are one or more of a one-dimensional photonic crystal, a two-dimensional photonic crystal, a three-dimensional photonic crystal, and a band-pass filtering optical film.

Further, the frequency conversion element is a nonlinear optical crystal element, and the frequency conversion material is one or more of an up-conversion luminescent material and a down-conversion luminescent material.

Further, the first wavelength selective device and the second wavelength selective device are both provided with a substrate, and the first wavelength selective device and the second wavelength selective device are attached to the substrate.

Further, the material of the substrate is high-temperature-resistant organic glass or plastic.

Further, the surface of the substrate contacting with the wavelength selector has a finish IV grade and has light transmittance of more than 93 percent.

The invention has the beneficial effects that: the structure of the invention can realize the forward conduction and the reverse cut-off of the optical path, has high conduction/cut-off intensity ratio of forward and reverse optical signal transmission, has simple structure, easy integration, short manufacturing period, low cost and selectable and adjustable wavelength frequency of the signal light source, thereby being used as an optical switch device, having high freedom degree of signal control and setting, realizing multiplexing, large transmission information capacity and excellent data confidentiality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a diagram of a simulation of the present invention.

FIG. 3 is a schematic diagram of the structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, an all-optical diode device includes a first wavelength selective element 1, a second wavelength selective element 2, and a frequency conversion member 3 disposed between the first wavelength selective element 1 and the second wavelength selective element 2, where the first wavelength selective element 1 is transparent to light with a first wavelength and reflects light with a second wavelength, the second wavelength selective element 2 is reflective to light with the first wavelength and transmits light with the second wavelength, and the frequency conversion member 3 is configured to convert light with the first wavelength into light with a second wavelength, and is one of a frequency conversion element and a frequency conversion material.

The working principle of the all-optical diode device of the invention is as follows:

when the optical signal source emits the first wavelength light with the specific wavelength to the second wavelength selective element, almost no light is transmitted from the element because the second wavelength selective element reflects the first wavelength light, and thus the unidirectional transmittance of the all-optical diode device is realized.

The first wavelength selective element 1 and the second wavelength selective element 2 are both provided with a substrate, and the first wavelength selective element 1 and the second wavelength selective element 2 are attached to a substrate 4.

The substrate 4 is made of high-temperature-resistant organic glass or plastic.

And the surface of the substrate 4, which is contacted with the wavelength selector, has a finish IV grade and light transmittance of more than 93 percent.

Preferably, the first wavelength selective element 1 and the second wavelength selective element 2 are one or more optical filters such as one-dimensional photonic crystals, two-dimensional photonic crystals, three-dimensional photonic crystals, and band-pass filter optical films. When the second wavelength selective element is a plurality of optical filters such as one-dimensional photonic crystals, two-dimensional photonic crystals, three-dimensional photonic crystals, band-pass filtering optical films and the like, the plurality of optical filters are bonded with the frequency conversion layer by using optical cement, and can be compounded by coating modes such as vacuum plating, vacuum sputtering, ion plating, chemical vapor deposition and the like or attached to one surface of the substrate by vacuum plating, vacuum sputtering, ion plating, chemical vapor deposition and the like, the other surface of the substrate is bonded with the frequency conversion layer by using the optical cement, and the refractive index of the substrate is similar to that of the optical cement and does not absorb the light of the first wavelength and the light of the second wavelength.

Preferably, the frequency conversion element is a nonlinear optical crystal element, and the frequency conversion material is one or more of an up-conversion luminescent material and a down-conversion luminescent material. When the frequency conversion material is a plurality of types of up-conversion luminescent materials and down-conversion luminescent materials, the plurality of types of materials are mixed by optical cement. The nonlinear optical crystal element is BBO crystal, CLBO crystal, LBO crystal, KTP crystal, GTR-KTP crystal, RTP crystal, KTA crystal, BIB3O6 crystal, LiNbO3 crystal, MgO LiNbO3 crystal, LiIO3 crystal or KD P & KDP crystal,

the frequency conversion layer is bonded with the first wavelength selection element and the second wavelength selection element into a whole through optical cement, the optical cement is a synthetic resin transparent adhesive formed by organic silica gel and unsaturated polyester, polyurethane, epoxy resin or light curing cement, and the epoxy resin and the light curing cement with higher refractive index after curing are preferably selected.

The effect of the implementation of the present invention is explained below according to an example:

according to the above structure, the light signal source emits blue light having a wavelength of 450nm, the light signal source directs light in a forward direction from the first wavelength selective element, the light signal source directs light in a reverse direction from the second wavelength selective element, the first wavelength selective element and the second wavelength selective element are specific wavelength selective devices based on a photonic crystal structure, for example, the frequency conversion layer can convert the blue light signal having a wavelength of 450nm into a red light signal having a wavelength of 660nm, the first wavelength selective element reflects red light having a wavelength of 660nm while transmitting blue light having a wavelength of 450nm, and the second wavelength selective element reflects blue light having a wavelength of 450nm while transmitting red light having a wavelength of 660 nm. Fig. 2 is obtained through an experiment, and in fig. 2, light is transmitted when the light is incident in the forward direction, and the light transmittance is almost zero when the light is incident in the reverse direction.

When light is transmitted in a medium, when the light intensity is weak, the refractive index or the polarizability of the optical property of the medium is constant regardless of the light intensity, the physical property of the medium is not changed by the light, and the light transmission follows the linear optical law. When the intensity of the light reaches the intensity of the laser, the light interacts with the medium, physical properties of the medium such as refractive index and polarizability are changed, and nonlinear optical effects such as higher harmonics, optical mixing and stimulated Raman radiation are generated.

The following explains how the frequency conversion layer uses a nonlinear optical crystal with a high nonlinear coefficient to achieve the frequency conversion effect through the frequency doubling effect:

the frequency multiplication principle is as follows: frequency omega₁When the incident nonlinear photonic crystal satisfies the phase matching condition 2k (omega)₁)＝k(ω₂≡2ω₁) Then, the frequency conversion of the frequency ω 1 → ω 2 (where k (ω)₁) Is a frequency of omega₁Frequency of photons, k (ω)₂) Slope rate of frequency doubled photons). With negative uniaxial crystals (n)_o>n_e，n_oIs the refractive index of o light (ordinary light), n_eE-ray (very light) refractive index) for example, the frequency doubling effect can be achieved by two phase matching methods. Class I phase matching, which converts two o lights with the same frequency into a frequency-doubled e light, i.e. k_o(ω)+k_o(ω)→k_e(2. omega.). Class II phase matching, converting an o-beam and an e-beam of the same frequency into a frequency-doubled e-beam, i.e. k_o(ω)+k_o(ω)→k_e(2ω)。

In the invention, the frequency conversion layer uses negative uniaxial crystal barium metaborate (BBO) as a frequency doubling conversion material, and realizes I-type phase matching through angle tuning. To satisfy phase matching k_o(ω), then, it needs no (ω, θ m) ═ ne (2 ω, θ m), i.e. when the ordinary ray with frequency ω propagates in the crystal along an angle θ m deviating from the optical axis (z axis) of the BBO crystal, the refractive index ne (2 ω, θ m) of the frequency-doubled e-ray is the same as the refractive index no (ω, θ m) of the original frequency o-ray.

Referring to fig. 3, a laser signal (with an intensity of about 100GW/cm2) with a wavelength of 1064nm is emitted from an optical signal source, passes through a first wavelength selective element along the Z-axis, and is irradiated onto a sheet BBO crystal with a thickness of 0.5mm or more and less than 1mm, and after the crystal is cut, the class I phase matching is satisfied. So that its principal optical axis forms a phase matching angle thetam with the z-axis perpendicular to the crystal surface. The phase matching angle θ calculates the value of θ m according to the Sellmeier equation. The phase matching angle thetam enables laser with the wavelength of 1064nm to be converted into 532nm wavelength to be emitted through the nonlinear frequency doubling effect in the crystal, and meanwhile, because the laser cannot be converted completely at one time, part of unconverted laser is reflected by the second wavelength selection element, is converted into emergent light through the nonlinear frequency doubling effect and is reflected by the first wavelength selection element, and at the moment, the emergent light does not meet the condition of generating the nonlinear frequency doubling effect, so the emergent light is not influenced by the nonlinear optical crystal and is emitted towards the direction of the second wavelength selection element.

The BBO crystal is frequency doubled for conversion to be only one embodiment of the present invention. The structure and size of the frequency conversion element can be designed by selecting a specific nonlinear photonic crystal material and nonlinear optical effect according to the wavelength frequency conversion requirement by a person skilled in the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.