WO2018041174A1 - Magnetic surface fast wave photodiode with magneto-optical thin film - Google Patents
Magnetic surface fast wave photodiode with magneto-optical thin film Download PDFInfo
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- WO2018041174A1 WO2018041174A1 PCT/CN2017/099811 CN2017099811W WO2018041174A1 WO 2018041174 A1 WO2018041174 A1 WO 2018041174A1 CN 2017099811 W CN2017099811 W CN 2017099811W WO 2018041174 A1 WO2018041174 A1 WO 2018041174A1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/095—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/095—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
- G02F1/0955—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators
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Abstract
Disclosed is a magnetic surface fast wave photodiode with a magneto-optical thin film, comprising an optical input port (1), an optical output port (2), a magneto-optical thin film (3), a background medium (4) and a bias magnetic field. The magneto-optical thin film (3) is arranged in the background medium (4). The magneto-optical thin film (3) uses a magneto-optical material. The photodiode is composed of the magneto-optical thin film (3) and the background medium (4). The left end of the photodiode is an optical input end, and the right end thereof is an optical output end. The surfaces of the magneto-optical thin film (3) and the background medium (4) are provided with magnetic surface fast waves. The bias magnetic field is arranged at the magneto-optical thin film (3). The photodiode has a simple structure, has a high optical transmission efficiency, is small in size, is convenient to integrate, is applicable to large-scale optical path integration, and has broad application prospects.
Description
本发明涉及一种磁光材料、磁表面波和光二极管，更具体地说，本发明涉及一种磁光薄膜磁表面快波光二极管。The present invention relates to a magneto-optical material, a surface acoustic wave and a photodiode, and more particularly to a magneto-optical thin film magnetic surface fast wave photodiode.
光二极管和隔离器是一种只允许光往一个方向传播的光学器件，应用于阻止不必要的光反馈。传统的光二极管和隔离器的主元件是法拉第旋光器，应用了法拉第效应(磁光效应)作为其工作原理。传统的法拉第隔离器由起偏器、法拉第旋光器和检偏器组成，这种器件结构复杂，通常被应用在自由空间的光系统中。对于集成光路，光纤或波导等集成光器件都是非偏振维持系统，会导致偏振角的损耗，因而不适用法拉第隔离器。Photodiodes and isolators are optics that only allow light to travel in one direction and are used to prevent unwanted light feedback. The main component of conventional photodiodes and isolators is the Faraday rotator, which applies the Faraday effect (magneto-optical effect) as its working principle. Conventional Faraday isolators consist of a polarizer, a Faraday rotator, and an analyzer. This device is complex in structure and is commonly used in free-space optical systems. For integrated optical paths, integrated optical devices such as fiber optics or waveguides are non-polarization-maintaining systems that cause loss of polarization angle and are therefore not suitable for use with pull-up isolators.
发明内容Summary of the invention
本发明的目的是克服现有技术中的不足之处，提供一种结构简单有效，光传输效率高，体积小，便于集成的磁光材料薄膜磁表面快波光二极管。The object of the present invention is to overcome the deficiencies in the prior art and provide a magneto-optical material thin film magnetic surface fast wave photodiode with simple and effective structure, high light transmission efficiency, small volume and easy integration.
本发明的目的通过下述技术方案予以实现。The object of the present invention is achieved by the following technical solutions.
本发明一种磁光薄膜磁表面快波光二管包括一个光输入端、一个光输出端、一个磁光薄膜、背景介质、一个偏置磁场；所述磁光薄膜设置于背景介质中；所述磁光薄膜采用磁光材料；所述光二极管和隔
离器由磁光材料和背景介质构成；所述光二极管和隔离器的左端为光输入端，其右端为光输出端；所述磁光材料与背景介质的表面处为磁表面快波；所述磁光薄膜处设置有偏置磁场。The magneto-optical thin film magnetic surface fast wave light tube comprises a light input end, a light output end, a magneto-optical film, a background medium, and a bias magnetic field; the magneto-optical film is disposed in the background medium; The magneto-optical film uses a magneto-optical material; the photodiode and the spacer
The separator is composed of a magneto-optical material and a background medium; the left end of the photodiode and the isolator is a light input end, and the right end thereof is a light output end; and the surface of the magneto-optical material and the background medium is a magnetic surface fast wave; A bias magnetic field is disposed at the magneto-optical film.
所述磁表面快波光二极管由磁光薄膜设置于背景介质中构成。The magnetic surface fast wave photodiode is composed of a magneto-optical film disposed in a background medium.
所述光二极管由磁光薄膜与背景介质的分界面构成光波导可单向传输光信号。The photodiode is composed of an interface of a magneto-optical film and a background medium to form an optical waveguide for unidirectionally transmitting optical signals.
所述磁光薄膜与背景介质的分界面为直波导结构。The interface between the magneto-optical film and the background medium is a straight waveguide structure.
所述直波导为TE工作模式波导。The straight waveguide is a TE working mode waveguide.
所述磁光材料为磁光玻璃或者各种稀土元素掺杂的石榴石和稀土-过渡金属合金薄膜等材料。The magneto-optical material is magneto-optical glass or various rare earth element-doped garnets and rare earth-transition metal alloy films.
所述背景介质材料为工作波透明的材料。The background dielectric material is a material that is transparent to the working wave.
所述背景介质材料为普通介质材料、空气、玻璃。The background medium material is a common dielectric material, air, glass.
所述偏置磁场由电磁铁或永久磁铁产生。The bias magnetic field is generated by an electromagnet or a permanent magnet.
本发明适合应用于大规模光路集成，具有广泛的应用前景。它与现有技术相比，具有如下积极效果。The invention is suitable for large-scale optical path integration and has wide application prospects. Compared with the prior art, it has the following positive effects.
1.结构简单，便于实现。1. The structure is simple and easy to implement.
2.光传输效率高。2. High optical transmission efficiency.
3.体积小，便于集成。3. Small size for easy integration.
图1为磁光薄膜磁表面快波光二极管的结构图。1 is a structural view of a magneto-optical thin film magnetic surface fast wave photodiode.
图中：光输入端1 光输出端2 磁光薄膜3 背景介质4 偏
置磁场⊕H0 磁光薄膜厚度wIn the figure: light input terminal 1 light output terminal 2 magneto-optical film 3 background medium 4 bias magnetic field ⊕H 0 magneto-optical film thickness w
图2为磁光薄膜磁表面快波光二极管的单向导通工作原理图。2 is a schematic diagram of the unidirectional conduction operation of a magneto-optical thin film magnetic surface fast wave photodiode.
图3为磁光薄膜磁表面快波光二极管的正反向传输效率随光波频率变化的第一种实施例曲线图。Fig. 3 is a graph showing a first embodiment of the forward and reverse transmission efficiency of a magneto-optical thin film magnetic surface fast wave photodiode as a function of lightwave frequency.
图4为磁光薄膜磁表面快波光二极管的正反向传输效率随光波频率变化的第二种实施例曲线图。Figure 4 is a graph showing a second embodiment of the forward and reverse transmission efficiency of a magneto-optical thin film magnetic surface fast wave photodiode as a function of lightwave frequency.
图5为磁光薄膜磁表面快波光二极管的正反向传输效率随光波频率变化的第三种实施例曲线图。Fig. 5 is a graph showing a third embodiment of the forward and reverse transmission efficiency of the magneto-optical thin film magnetic surface fast wave photodiode as a function of the light wave frequency.
如图1所示,，本发明磁光材料薄膜磁表面快波光二极管包括一个光输入端1、一个光输出端2、一个磁光薄膜3、背景介质4和一个偏置磁场H0；磁表面快波光二极管由磁光材料薄膜3设置于背景介质4中构成，磁光薄膜3采用磁光材料，即磁光材料薄膜，磁光材料薄膜3与背景介质4交界面为光能量主要集中的区域，由磁光材料薄膜与背景介质的分界面构成光波导可单向传输光信号，即为光二极管，光二极管和隔离器由磁光材料和背景介质构成。磁光材料为磁光玻璃或者各种稀土元素掺杂的石榴石和稀土-过渡金属合金薄膜等材料；磁光材料薄膜3与背景介质4的分界面为直波导结构，本发明波导为TE工作模式波导；磁光材料薄膜3与背景介质4的表面处为磁表面快波；背景介质材料可以采用工作波透明的材料，也可以采用普通介质材料、空气或玻璃。磁光材料薄膜3处设置有偏置磁场⊕
H0(里)，偏置磁场H0由偏置磁场由电磁铁或永久磁铁产生；当偏置磁场H0垂直于纸面向里时，光二极管和隔离器的左端为光输入端，其右端为光输出端；光波从端口1输入到端口2输出为单向导通。As shown in FIG. 1, the magneto-optical material thin film magnetic surface fast wave photodiode of the present invention comprises a light input end 1, a light output end 2, a magneto-optical film 3, a background medium 4 and a bias magnetic field H 0 ; The fast-wavelength photodiode is formed by the magneto-optical material film 3 disposed in the background medium 4. The magneto-optical film 3 is made of a magneto-optical material, that is, a magneto-optical material film, and the interface between the magneto-optical material film 3 and the background medium 4 is a region where the light energy is mainly concentrated. The optical waveguide formed by the interface between the magneto-optical material film and the background medium can transmit optical signals unidirectionally, that is, the photodiode, and the photodiode and the isolator are composed of the magneto-optical material and the background medium. The magneto-optical material is magneto-optical glass or various rare earth-doped garnets and rare earth-transition metal alloy films; the interface between the magneto-optical material film 3 and the background medium 4 is a straight waveguide structure, and the waveguide of the present invention is a TE working mode. The waveguide; the surface of the magneto-optical material film 3 and the background medium 4 are magnetic surface fast waves; the background medium material may be a transparent material of working wave, or a common dielectric material, air or glass. The magneto-optical material film 3 is provided with a bias magnetic field ⊕ H 0 (in), and the bias magnetic field H 0 is generated by an electromagnet or a permanent magnet by a bias magnetic field; when the bias magnetic field H 0 is perpendicular to the paper surface, the photodiode The left end of the isolator is the optical input end, and the right end is the optical output end; the light wave is input from port 1 to port 2 and the output is unidirectional.
磁光材料-介质界面所产生的磁表面波是一种类似于金属表面等离子激元(SPP)的现象。磁光材料在偏置静磁场的作用下，磁导率为张量形式，同时，在一定的光波段范围内，其有效折射率为负值。因而，磁光材料的表面能够产生一种导波，且具有单向传播的性能，称为磁表面波(表面磁极化子波，SMP)。The magnetic surface wave generated by the magneto-optical material-medium interface is a phenomenon similar to the metal surface plasmon (SPP). Under the action of the biased static magnetic field, the magneto-optical material has a magnetic permeability of tensor, and at the same time, its effective refractive index is negative in a certain optical band. Thus, the surface of the magneto-optical material is capable of producing a guided wave and has a property of unidirectional propagation, which is called a surface acoustic wave (Surface Magnetically Polarized Wave, SMP).
本发明磁光材料薄膜波导磁表面快波光二极管，将磁光材料薄膜设置于背景介质(空气)中构成，利用磁光材料-介质界面产生的磁表面快波来进行光的单向传输。The magneto-optical material thin film waveguide magnetic surface fast wave photodiode of the present invention is configured by disposing a magneto-optical material film in a background medium (air), and unidirectionally transmitting light by using a magnetic surface fast wave generated by a magneto-optical material-medium interface.
本发明技术方案是基于磁光材料所具有的光非互易性和磁光材料-介质界面所具有独特的可传导表面波特性，实现光二极管和隔离器的设计。该技术方案的基本原理如下：The technical scheme of the invention realizes the design of the photodiode and the isolator based on the optical non-reciprocity of the magneto-optical material and the unique conductive surface wave characteristic of the magneto-optical material-medium interface. The basic principles of this technical solution are as follows:
磁光材料是一种具有磁各向异性的材料，由外加静磁场导致磁光材料内部的磁偶极子按同一方向排列，进而产生磁偶极矩。磁偶极矩将和光信号发生强烈的相互作用，进而产生光的非互易性传输。在方向为垂直纸面向外的偏置磁场H0的作用下，磁光材料的磁导率张量为：The magneto-optical material is a material having magnetic anisotropy, and the magnetic dipole inside the magneto-optical material is arranged in the same direction by the application of a static magnetic field, thereby generating a magnetic dipole moment. The magnetic dipole moment will interact strongly with the optical signal, which in turn produces a non-reciprocal transmission of light. The magnetic permeability tensor of the magneto-optical material is under the action of a bias magnetic field H 0 oriented in the direction perpendicular to the vertical paper:
磁导率张量的矩阵元由以下方程组给出：The matrix elements of the permeability tensor are given by the following equations:
其中，μ0为真空中的磁导率，γ为旋磁比，H0为外加磁场，Ms为饱和磁化强度，ω为工作频率，α为损耗系数。若改变偏置磁场的方向为垂直纸面向里，则H0和Ms将改变符号。Where μ 0 is the magnetic permeability in vacuum, γ is the gyromagnetic ratio, H 0 is the applied magnetic field, M s is the saturation magnetization, ω is the operating frequency, and α is the loss coefficient. If the direction of the biasing magnetic field is changed to the vertical paper facing direction, H 0 and M s will change the sign.
磁光材料-介质界面所产生的磁表面波则可以根据磁光材料的磁导率张量和麦克斯韦方程组求解得出。满足表面波(为TE波)在界面存在的电场和磁场应当有如下的形式：The magnetic surface wave generated by the magneto-optical material-medium interface can be solved according to the magnetic permeability tensor of the magneto-optical material and Maxwell's equations. The electric and magnetic fields that satisfy the surface wave (which is a TE wave) at the interface should have the following form:
其中i＝1代表磁光材料区域，i＝2代表介质区域。代入麦克斯韦方程组：Where i=1 represents the magneto-optical material region and i=2 represents the dielectric region. Substituting Maxwell's equations:
再根据本构关系式和边界条件，可得出关于磁表面波的波矢kz的超越方程：According to the constitutive relation and the boundary conditions, the transcendental equation about the wave vector k z of the magnetic surface wave can be obtained:
其中，
为磁光材料的有效磁导率。此超越方程可以由数值解法求解，最终得到kz的值。也可从方程看出，由于方程包含μκkz的项，所以，磁表面波具有非互易性(单向传播)。
among them, It is the effective permeability of magneto-optical materials. This transcendental equation can be solved by a numerical solution, and finally the value of k z is obtained. It can also be seen from the equation that since the equation contains the term of μ κ k z , the surface acoustic wave has non-reciprocity (one-way propagation).
可见，在磁光材料薄膜处加入偏置静磁场，并使用普通介质材料、空气或玻璃作为背景材料，那么将构成有效的光二极管。如图2所示，采用钇铁石榴石(YIG)作为磁各向异性材料，背景介质为空气(n0＝1)，磁光薄膜的偏置磁场大小为900Oe，磁光薄膜3的尺寸长l＝50mm，其厚度w＝22.5mm，器件的工作频率f由磁光材料和介质的介电常数ε1，ε2和磁导率[μ1]，μ2所决定，工作频率为f＝6GHz，YIG材料损耗系数α＝3×10-4。处于偏置磁场H0作用下，偏置静磁场方向为垂直纸面向里，当光从端口1输入时，在磁光材料-介质界面产生单向正向传输的磁表面波，最后从端口2输出；当光从端口2输入时，由于磁表面波的非互易性导致光波不能够在器件里面反向传输，从而无法从端口1输出，光能量已全部在端口2处被阻挡。光二极管和隔离器的导通方向由外加磁场的方向所决定，当磁光材料所加入的静磁场方向与前面所述的相反时，其导通方向是相反的。It can be seen that by adding a bias static magnetic field to the magneto-optical material film and using a common dielectric material, air or glass as the background material, an effective photodiode will be formed. As shown in Fig. 2, yttrium iron garnet (YIG) is used as the magnetic anisotropic material, the background medium is air (n 0 =1), the bias magnetic field of the magneto-optical film is 900 Oe, and the magneto-optical film 3 is long in size. l=50mm, its thickness w=22.5mm, the operating frequency f of the device is determined by the dielectric constants ε 1 , ε 2 and magnetic permeability [μ 1 ], μ 2 of the magneto-optical material and the medium, and the operating frequency is f= 6GHz, YIG material loss factor α = 3 × 10 -4 . Under the action of the bias magnetic field H 0 , the direction of the biasing static magnetic field is the vertical paper surface. When the light is input from the port 1, a magnetic surface wave is generated in the unidirectional forward transmission at the magneto-optical material-medium interface, and finally from the port 2 Output; when light is input from port 2, the light wave cannot be reversely transmitted inside the device due to the non-reciprocity of the surface acoustic wave, so that it cannot be output from port 1, and the light energy is all blocked at port 2. The conduction direction of the photodiode and the isolator is determined by the direction of the applied magnetic field. When the direction of the static magnetic field to which the magneto-optical material is applied is opposite to that described above, the conduction direction is opposite.
本发明器件的磁光薄膜磁表面快波光二极管采用磁光材料设置于普通介质材料中，磁光薄膜3的尺寸长度l和厚度w可以灵活地根据工作波长和实际需求进行选择。The magneto-optical thin film magnetic surface fast wave photodiode of the device of the invention is disposed in a common dielectric material by using a magneto-optical material, and the size length l and the thickness w of the magneto-optical film 3 can be flexibly selected according to the working wavelength and actual requirements.
下面结合附图给出三个实施例，在实施例中采用钇铁石榴石(YIG)作为磁各向异性材料，偏置磁场大小为900Oe，磁场方向为垂直纸面向里，磁光薄膜3的厚度为w，YIG材料损耗系数α＝3×10-4，器件的工作频率f由磁光材料和介质的介电常数ε1，ε2和磁导率[μ1]，μ2所决定。
Three embodiments are given below with reference to the accompanying drawings. In the embodiment, yttrium iron garnet (YIG) is used as the magnetic anisotropic material, the bias magnetic field is 900 Oe, the magnetic field direction is vertical paper facing, and the magneto-optical film 3 is The thickness is w, the YIG material loss coefficient α = 3 × 10 -4 , and the operating frequency f of the device is determined by the dielectric constants ε 1 , ε 2 and magnetic permeability [μ 1 ], μ 2 of the magneto-optical material and the medium.
实施例1Example 1
参照图1，磁表面快波光二极管由磁光薄膜设置于普通介质中构成磁表面快波光二极管，背景介质4为空气(n0＝1)，磁光薄膜3的厚度为w＝5mm。在工作频段内，从端口1输入的光波将在器件内部产生磁表面波，进而通过器件从端口2输出；而从端口2输入的光波将被器件所阻挡，无法从端口1输出。参照图3，直波导结构的光二极管和隔离器的工作频率范围是4.52GHz～7.26GHz。在工作频率范围内，考虑材料损耗，光二极管和隔离器最高达到正反向传输隔离度为21.9586dB，正向传输插入损耗为0.0146dB。Referring to Fig. 1, a magnetic surface fast wave photodiode is formed by a magneto-optical film in a common medium to constitute a magnetic surface fast wave photodiode, the background medium 4 is air (n 0 =1), and the thickness of the magneto-optical film 3 is w=5 mm. In the operating band, the light wave input from port 1 will generate a magnetic surface wave inside the device, which is then output from port 2 through the device; and the light wave input from port 2 will be blocked by the device and cannot be output from port 1. Referring to Fig. 3, the operating frequency range of the photodiode and the isolator of the straight waveguide structure is 4.52 GHz to 7.26 GHz. In the operating frequency range, considering the material loss, the photodiode and the isolator have a maximum forward-reverse transmission isolation of 21.9586 dB and a forward transmission insertion loss of 0.0146 dB.
实施例2Example 2
参照图1，磁表面快波光二极管由磁光薄膜设置于普通介质中构成，背景介质4为空气(n0＝1)，磁光薄膜3的厚度为w＝7mm。在工作频段内，从端口1输入的光波将在器件内部产生磁表面波，进而通过器件从端口2输出；而从端口2输入的光波将被器件所阻挡，无法从端口1输出。参照图4，直波导结构的光二极管和隔离器的工作频率范围是4.58GHz～7.20GHz。在工作频率范围内，考虑材料损耗，光二极管和隔离器最高达到正反向传输隔离度为25.0863dB，正向传输插入损耗为0.0146dB。Referring to Fig. 1, a magnetic surface fast wave photodiode is composed of a magneto-optical film disposed in a common medium, the background medium 4 is air (n 0 =1), and the magneto-optical film 3 has a thickness of w = 7 mm. In the operating band, the light wave input from port 1 will generate a magnetic surface wave inside the device, which is then output from port 2 through the device; and the light wave input from port 2 will be blocked by the device and cannot be output from port 1. Referring to Fig. 4, the operating frequency range of the photodiode and the isolator of the straight waveguide structure is 4.58 GHz to 7.20 GHz. In the operating frequency range, considering the material loss, the photodiode and the isolator have a maximum forward-reverse transmission isolation of 25.0863 dB and a forward transmission insertion loss of 0.0146 dB.
实施例3Example 3
参照图1，磁表面快波光二极管由磁光薄膜设置于普通介质中构成，背景介质4为玻璃(n0＝1.5)，磁光薄膜3的厚度为w＝7mm。
在工作频段内，从端口1输入的光波将在器件内部产生磁表面波，进而通过器件从端口2输出；而从端口2输入的光波将被器件所阻挡，无法从端口1输出。参照图5，直波导结构的光二极管和隔离器的工作频率范围是4.62GHz～7.16GHz。在工作频率范围内，考虑材料损耗，光二极管和隔离器最高达到正反向传输隔离度为23.6151dB，正向传输插入损耗为0.0622dB。Referring to Fig. 1, a magnetic surface fast wave photodiode is composed of a magneto-optical film disposed in a common medium, a background medium 4 is glass (n 0 = 1.5), and a thickness of the magneto-optical film 3 is w = 7 mm. In the operating band, the light wave input from port 1 will generate a magnetic surface wave inside the device, which is then output from port 2 through the device; and the light wave input from port 2 will be blocked by the device and cannot be output from port 1. Referring to FIG. 5, the operating frequency range of the photodiode and the isolator of the straight waveguide structure is 4.62 GHz to 7.16 GHz. In the operating frequency range, considering the material loss, the photodiode and the isolator have a maximum forward-reverse transmission isolation of 23.6151 dB and a forward transmission insertion loss of 0.0622 dB.
由图3、图4和图5不同参数的磁光薄膜磁表面快波光二极管的传输效率曲线图可以得到磁光薄膜波导所传输磁表面快波的光频率范围，即光二极管的工作频率范围。从结果可知，本发明基于磁光材料薄膜波导的磁表面快波光二极管是能够有效工作的。The transmission efficiency curve of the magneto-optical thin film magnetic surface fast wave photodiode with different parameters of FIG. 3, FIG. 4 and FIG. 5 can obtain the optical frequency range of the magnetic surface fast wave transmitted by the magneto-optical thin film waveguide, that is, the operating frequency range of the photodiode. It can be seen from the results that the magnetic surface fast wave photodiode based on the magneto-optical material thin film waveguide of the present invention can work effectively.
以上所述本发明在具体实施方式及应用范围均有改进之处，不应当理解为对本发明限制。
The invention described above is susceptible to modifications of the specific embodiments and applications, and should not be construed as limiting the invention.
Claims (9)
- 一种磁光薄膜磁表面快波光二极管，其特征在于：其包括一个光输入端、一个光输出端、一个磁光薄膜、背景介质、一个偏置磁场；所述磁光薄膜设置于背景介质中；所述磁光薄膜采用磁光材料；所述光二极管和隔离器由磁光材料和背景介质构成；所述光二极管和隔离器的左端为光输入端，其右端为光输出端；所述磁光材料与背景介质的表面处为磁表面快波；所述磁光薄膜处设置有偏置磁场。A magneto-optical thin film magnetic surface fast wave photodiode, comprising: an optical input end, a light output end, a magneto-optical film, a background medium, and a bias magnetic field; wherein the magneto-optical film is disposed in the background medium The magneto-optical film adopts a magneto-optical material; the photodiode and the isolator are composed of a magneto-optical material and a background medium; the left end of the photodiode and the isolator is an optical input end, and the right end thereof is a light output end; The surface of the magneto-optical material and the background medium is a magnetic surface fast wave; the magneto-optical film is provided with a bias magnetic field.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述磁表面快波光二极管由磁光薄膜设置于背景介质中构成。A magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein said magnetic surface fast wave photodiode is formed by a magneto-optical film disposed in a background medium.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述光二极管由磁光薄膜与背景介质的分界面构成光波导可单向传输光信号。The magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein the photodiode comprises an optical waveguide formed by an interface between the magneto-optical film and the background medium to transmit an optical signal in one direction.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述磁光薄膜与背景介质的分界面为直波导结构；The magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein the interface between the magneto-optical film and the background medium is a straight waveguide structure;
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述直波导为TE工作模式波导。The magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein said straight waveguide is a TE operation mode waveguide.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述磁光材料为磁光玻璃或者各种稀土元素掺杂的石榴石和稀土-过渡金属合金薄膜等材料。The magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein the magneto-optical material is magneto-optical glass or various rare earth doped garnets and rare earth-transition metal alloy films.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述背景介质材料为工作波透明的材料。The magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein said background dielectric material is a material that is transparent to the working wave.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述背景介质材料为普通介质材料、空气、玻璃。 The magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein the background dielectric material is a common dielectric material, air, or glass.
- 按照权利要求1所述的磁光薄膜磁表面快波光二极管,其特征在于：所述偏置磁场由电磁铁或永久磁铁产生。 A magneto-optical thin film magnetic surface fast wave photodiode according to claim 1, wherein said bias magnetic field is generated by an electromagnet or a permanent magnet.
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