WO2018041183A1 - 无泄漏磁光薄膜磁表面快波方向可控光二极管 - Google Patents

无泄漏磁光薄膜磁表面快波方向可控光二极管 Download PDF

Info

Publication number
WO2018041183A1
WO2018041183A1 PCT/CN2017/099820 CN2017099820W WO2018041183A1 WO 2018041183 A1 WO2018041183 A1 WO 2018041183A1 CN 2017099820 W CN2017099820 W CN 2017099820W WO 2018041183 A1 WO2018041183 A1 WO 2018041183A1
Authority
WO
WIPO (PCT)
Prior art keywords
magneto
optical
photodiode
thin film
magnetic surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/099820
Other languages
English (en)
French (fr)
Inventor
欧阳征标
郑耀贤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen University
Original Assignee
Shenzhen University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen University filed Critical Shenzhen University
Publication of WO2018041183A1 publication Critical patent/WO2018041183A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a magneto-optical material, a surface wave and a photodiode. More particularly, the present invention relates to a leak-free magneto-optical material void waveguide magnetic surface fast wave direction controllable photodiode.
  • 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.
  • a conventional Faraday isolator consists of a polarizer, a Faraday rotator, and an analyzer. This device is complex in structure and is commonly used in free-space optical systems.
  • 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.
  • the object of the present invention is to overcome the deficiencies in the prior art, and to provide a leakage-free magneto-optical film magnetic surface fast wave direction controllable photodiode with simple and effective structure, high optical transmission efficiency, small volume and easy integration.
  • the leakage-free magneto-optical material thin film waveguide magnetic surface fast wave direction controllable photodiode comprises an optical input port, a light output port, a magneto-optical film, a background medium, Two absorbing layers and a controllable bias magnetic field; the magneto-optical film is disposed in a background medium; the magneto-optical film is 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 port or an output port, and the right end thereof is a light output port or an input port; the surface of the magneto-optical material and the background medium is a magnetic surface fast wave; the magneto-optical film is A controlled bias magnetic field is provided.
  • the magnetic surface fast wave photodiode is composed of a magneto-optical film disposed in a background medium.
  • 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.
  • the interface between the magneto-optical film and the background medium is a straight waveguide structure; the straight waveguide is a TE working mode waveguide.
  • the magneto-optical material is magneto-optical glass or various rare earth element-doped garnets and rare earth-transition metal alloy films.
  • the background dielectric material is a material that is transparent to the working wave.
  • the background medium is a common dielectric material, air or glass.
  • the absorbing layer is the same or different absorbing materials; the absorbing material is polyurethane, graphite, graphene, carbon black, carbon fiber epoxy resin mixture, graphite thermoplastic material mixture, boron fiber epoxy resin mixture , graphite fiber epoxy resin mixture, epoxy polysulfide, silicone rubber, urethane, fluoroelastomer, polyetheretherketone, polyethersulfone, polyarylsulfone or polyethyleneimine.
  • the absorbing material is polyurethane, graphite, graphene, carbon black, carbon fiber epoxy resin mixture, graphite thermoplastic material mixture, boron fiber epoxy resin mixture , graphite fiber epoxy resin mixture, epoxy polysulfide, silicone rubber, urethane, fluoroelastomer, polyetheretherketone, polyethersulfone, polyarylsulfone or polyethyleneimine.
  • the distance between the two absorbing layers and the surface of the straight waveguide is 1/4 to 1/2 wavelength, respectively; the thickness of the two absorbing layers are each not less than 1/4 wavelength.
  • the bias magnetic field is generated by a current direction controllable electromagnet or a permanent magnet, and the permanent magnet Can rotate.
  • 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.
  • the structure is simple and easy to implement.
  • Figure 1 is a structural diagram of a non-leaked magneto-optical film magnetic surface fast wave direction controllable photodiode.
  • Fig. 2 is a schematic diagram showing the operation of the rightward unidirectional conduction of the non-leakage magneto-optical film magnetic surface fast wave direction controllable photodiode.
  • Figure 3 is a schematic diagram of the left-handed single-conduction operation of the non-leakage magneto-optical film magnetic surface fast-wave direction controllable photodiode.
  • Fig. 4 is a graph showing a first embodiment of the forward-reverse transmission efficiency of the non-leakage magneto-optical film magnetic surface fast-wave direction controllable photodiode as a function of the optical frequency.
  • Figure 5 is the forward and reverse of the non-leakage magneto-optical film magnetic surface fast wave direction controllable photodiode A second embodiment graph of transmission efficiency as a function of lightwave frequency.
  • Fig. 6 is a graph showing a third embodiment of the forward-reverse transmission efficiency of the non-leakage magneto-optical film magnetic surface fast-wave direction controllable photodiode as a function of the optical frequency.
  • the leakage-free magneto-optical film magnetic surface fast wave direction controllable photodiode of the present invention comprises a light input port 1, a light output port 2, a magneto-optical film 3, a background medium 4, and a first absorber layer. 5.
  • the second absorbing layer 6 and a controllable bias magnetic field H 0 , the magnetic surface fast wave photodiode is formed by the magneto-optical material film 3 disposed in the background medium 4, and the magneto-optical film 3 is made of a magneto-optical material, that is, a magneto-optical material.
  • the film, the interface of the magneto-optical material film 3 and the background medium 4 is a region where the light energy is mainly concentrated, and the optical waveguide formed by the interface between the magneto-optical material film 3 and the background medium 4 can transmit the optical signal in one direction, that is, the photodiode and the light.
  • the diode and isolator magneto-optical material and the background medium 4 are formed.
  • 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. As shown in Fig.
  • the left end of the photodiode and the isolator is the optical input port 1, and the right end is the optical output port 2; as shown in Fig. 1(b), the right end of the photodiode is the optical input port 2, The left end is the light output port 1; the surface of the magneto-optical material film 3 and the background medium 4 is a magnetic surface fast wave; the background medium material can 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 , that is, a bias magnetic field ⁇ H 0 (in) or a bias magnetic field ⁇ H 0 (outer), and the bias magnetic field H 0 is generated by an electromagnet whose current direction is controllable or Provided by a rotatable permanent magnet, the direction will determine the conduction direction of the diode, change the conduction direction of the photodiode by controlling the direction of the current, or change by rotating the permanent magnet.
  • the electromagnet current is controlled by the magneto-optical material and the direction of the magnetic field is perpendicular to the paper surface.
  • the left end of the photodiode and the isolator is the light input end 1, and the right end is the light output end 2, and the diode will be turned on from the port 1 to the port 2;
  • the direction of the control magnetic field is perpendicular to the paper, the right end of the diode is the light input end 2, the left end is the light output end 1, and the photodiode will be turned on from the port 2 to the port 1.
  • the first wave absorbing layer 5 and the second wave absorbing layer 6 are the same or different absorbing materials, and the absorbing materials are polyurethane, graphite, graphene, carbon black, carbon fiber epoxy resin mixture, graphite thermoplastic material mixture, boron Fiber epoxy resin mixture, graphite fiber epoxy resin mixture, epoxy polysulfide, silicone rubber, urethane, fluoroelastomer, polyetheretherketone, polyethersulfone, polyarylsulfone or polyethyleneimine; first The distance w 1 between the absorbing layer 5 and the second absorbing layer 6 and the waveguide surface respectively is 1/4 to 1/2 wavelength; the thicknesses of the first absorbing layer 5 and the second absorbing layer 6 are respectively not Less than 1/4 wavelength.
  • the surface acoustic wave generated by the interface between the magneto-optical material and the medium is a phenomenon similar to the metal surface plasmon (SPP).
  • SPP metal surface plasmon
  • the magneto-optical material 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.
  • 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).
  • the present invention is a non-leakage magneto-optical material thin film waveguide magnetic surface fast wave photodiode, which is based on the non-reciprocity of magneto-optical materials, and is excellent in combination with the characteristics of surface wave which can be generated by a magneto-optical material-medium interface. Performance of photodiodes and isolators.
  • the device provides a biased static magnetic field by a magneto-optical material, and the magneto-optical material film is disposed in the background medium and the combination of the absorbing layer, so that the magneto-optical material-medium interface generates a magnetic surface fast wave to perform light.
  • One-way transmission using an electromagnet with a controllable current direction to control the conduction direction of the photodiode.
  • the absorbing layer absorbs unwanted waves and eliminates optical path interference.
  • 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:
  • 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:
  • ⁇ 0 is the magnetic permeability in vacuum
  • ⁇ is the gyromagnetic ratio
  • H 0 is the applied magnetic field
  • M s is the saturation magnetization
  • ⁇ is the operating frequency
  • ⁇ 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.
  • 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:
  • YIG yttrium iron garnet
  • the bias magnetic field of the magneto-optical film 3 is 900 Oe
  • the thickness w 22.5mm
  • the working frequency f is defined by the magneto-optical material and the medium.
  • the YIG material loss coefficient ⁇ 3 ⁇ 10 -4 .
  • the magnetic field applied by the magneto-optical material film 3 is perpendicular to the paper surface.
  • a magnetic surface wave which is unidirectionally forwardly transmitted at the interface between the magneto-optical material and the medium is finally output from the optical wave port 2, that is, the direction is
  • the control diode is unidirectionally turned to the right; when the light wave is input from the port 2, the light wave cannot be reversely transmitted inside the device due to the non-reciprocity of the surface acoustic wave, and thus cannot be output from the output port 1.
  • Output port 1 does not have any lightwave output, and all of the light energy is blocked at input port 2.
  • the conduction direction of the photodiode is determined by the direction of the applied magnetic field.
  • the direction of the magnetic field is perpendicular to the paper, and the conduction direction of the diode is opposite.
  • the reverse light wave cannot be propagated inside due to the non-reciprocity of the device, and the output port 2 does not have any light wave output, and the light energy is all blocked at the output port 1; when the light wave is from the port 2 When input, the light wave can generate a magnetic surface wave inside the device, and then output from the output port 1, that is, the direction controllable diode is unidirectionally turned to the right.
  • the leakage-free magneto-optical film magnetic surface fast-wave photodiode of the invention is disposed in the background medium material by using a magneto-optical material film, and the size length l and the thickness w of the magneto-optical material film 3 can be flexibly selected according to the actual working wavelength and actual demand. Changing the size has no major impact on device performance.
  • yttrium iron garnet (YIG) is used as the magnetic anisotropic material
  • the bias magnetic field is 900 Oe
  • the magnetic field direction is the vertical paper surface
  • the thickness of the magneto-optical material film is w
  • the electromagnet current is controlled by the electromagnet current to apply the magnetic field direction to the vertical paper surface, and the photodiode will be turned on from the input port 1 to the output port 2; on the contrary, the control magnetic field direction is perpendicular to the paper facing outward, and the photodiode will be input. Port 2 to output port 1 are turned on. In both cases, the forward and reverse transmissions have the same efficiency. Referring to Fig.
  • the operating frequency range of the photodiode and the isolator of the direct waveguide structure is 5.00 GHz to 7.41 GHz.
  • the photodiode and the isolator have a maximum forward-reverse transmission isolation of 29.1 dB and a forward transmission insertion loss of 0.0079 dB.
  • the electromagnet current is controlled by the electromagnet current to apply the magnetic field direction to the vertical paper facing direction, and the photodiode will be turned on from port 1 to port 2; on the contrary, the direction of the control magnetic field is perpendicular to the paper, and the photodiode will be from port 2 to Port 1 is turned on. In both cases, the forward and reverse transmissions have the same efficiency. Referring to Fig.
  • the operating frequency range of the photodiode and the isolator of the direct waveguide structure is 5.00 GHz to 7.41 GHz.
  • the photodiode and the isolator can achieve a forward-reverse transmission isolation of 31.0 dB and a forward transmission insertion loss of 0.0082 dB.
  • the electromagnet current is controlled by the electromagnet current to apply the magnetic field direction to the vertical paper facing direction, and the photodiode will be turned on from port 1 to port 2; on the contrary, the direction of the control magnetic field is perpendicular to the paper, and the photodiode will be from port 2 to Port 1 is turned on. In both cases, the forward and reverse transmissions have the same efficiency. Referring to Fig.
  • the operating frequency range of the photodiode and the isolator of the direct waveguide structure is 5.00 GHz to 7.41 GHz.
  • the photodiode and the isolator have a maximum forward-to-reverse transmission isolation of 22.1 dB and a forward transmission insertion loss of 0.0399 dB.
  • the transmission efficiency curve of the magneto-optical film fast surface steerable photodiode with different parameters of Fig. 4, Fig. 5 and Fig. 6 can obtain the optical frequency range of the magnetic surface fast wave transmitted by the magneto-optical film waveguide, that is, the direction can be controlled
  • the operating frequency range of the photodiode As can be seen from the results, the present invention is based on the magneto-optical material thin film waveguide magnetic surface fast wave direction controllable photodiode can work effectively.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

一种无泄漏磁光薄膜磁表面快波方向可控光二极管，包括一个光输入端口（1、2）、一个光输出端口（1、2）、一个磁光薄膜（3）、背景介质（4）、两个吸波层（5、6）和一个可控偏置磁场（H0），磁光薄膜（3）设置于背景介质（4）中，磁光薄膜（3）采用磁光材料，光二极管和隔离器由磁光材料和背景介质（4）构成，光二极管和隔离器的左端为光输入端口（1）或光输出端口（1），其右端为光输出端口（2）或光输入端口（2），磁光材料与背景介质（4）的表面处为磁表面快波，磁光薄膜（3）处设置有可控偏置磁场（H0）。光二极管具有结构简单、便于实现、光传输效率高、体积小、便于集成，适合应用于大规模光路集成，具有广泛的应用前景。

Description

无泄漏磁光薄膜磁表面快波方向可控光二极管 技术领域
本发明涉及一种磁光材料、表面波和光二极管，更具体地说，本发明涉及一种无泄漏磁光材料空隙波导磁表面快波方向可控光二极管。
背景技术
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。
发明内容
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，便于集成的无泄漏磁光薄膜磁表面快波方向可控光二极管。
本发明的目的通过下述技术方案予以实现。
本发明无泄漏磁光材料薄膜波导磁表面快波方向可控光二极管包括一个光输入端口、一个光输出端口、一个磁光薄膜、背景介质、 两个吸波层和一个可控偏置磁场；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口或输出端口，其右端为光输出端口或输入端口；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可控偏置磁场。
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。
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。
所述磁光薄膜与背景介质的分界面为直波导结构；所述直波导为TE工作模式波导。
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。
所述背景介质材料为工作波透明的材料。
所述背景介质为普通介质材料、空气或玻璃。
所述吸波层为相同或不同的吸波材料；所述吸波材料为聚氨酯、石墨、石墨烯、炭黑、碳纤维环氧树脂混合体、石墨热塑性材料混合体、硼纤维环氧树脂混合体、石墨纤维环氧树脂混合体、环氧聚硫、硅橡胶、尿烷、氟弹性体、聚醚醚酮、聚醚砜、聚芳砜或者聚乙烯亚胺。
所述两个吸波层均分别与所述直波导表面的距离为1/4至1/2波长；所述两个吸波层的厚度均分别不小于1/4波长。
所述偏置磁场由电流方向可控电磁铁或永久磁铁产生，永久磁铁 能旋转。
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。
1.结构简单，便于实现。
2.光传输效率高。
3.体积小，便于集成。
附图说明
图1为无泄漏磁光薄膜磁表面快波方向可控光二极管的结构图。
图中1(a)：光输入端1  光输出端2  磁光薄膜3(磁光材料薄膜)  背景介质4  第一吸波层5  第二吸波层6  偏置磁场⊕H0(里)偏置磁场⊙H0(外)  磁光材料薄膜厚度w  吸波层与波导之间的距离w1
图中1(b)：光输出端1  光输入端2  磁光薄膜3(磁光材料薄膜)  背景介质4  第一吸波层5  第二吸波层6  偏置磁场⊙H0(外)磁光材料薄膜厚度w  吸波层与波导之间的距离w1
图2为无泄漏磁光薄膜磁表面快波方向可控光二极管的向右单向导通工作原理图。
图3为无泄漏磁光薄膜磁表面快波方向可控光二极管的向左单向导通工作原理图。
图4为无泄漏磁光薄膜磁表面快波方向可控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。
图5为无泄漏磁光薄膜磁表面快波方向可控光二极管的正反向 传输效率随光波频率变化的第二种实施例曲线图。
图6为无泄漏磁光薄膜磁表面快波方向可控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。
具体实施方式
下面结合附图与实施例对本发明作进一步的阐述：
如图1所示，本发明无泄漏磁光薄膜磁表面快波方向可控光二极管包括一个光输入端口1、一个光输出端口2、一个磁光薄膜3、背景介质4、第一吸波层5、第二吸波层6和一个可控偏置磁场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3与背景介质4的分界面构成光波导可单向传输光信号，即为光二极管，光二极管和隔离器磁光材料和背景介质4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；如图1(a)所示光二极管和隔离器的左端为光输入端口1，其右端为光输出端口2；如图1(b)所示光二极管的右端为光输入端口2，其左端为光输出端口1；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，即偏置磁场⊕H0(里)或偏置磁场⊙H0(外)，偏置磁场H0由电流方向可控的电磁铁产生或者由能旋转的永久磁铁提供，方向为将决 定二极管的导通方向，通过控制电流方向来改变光二极管的导通方向，或者通过旋转永久磁铁来改变。通过电磁铁电流控制磁光材料外加磁场方向垂直纸面向里，光二极管和隔离器的左端为光输入端1，其右端为光输出端2，二极管将从端口1到端口2导通；当外加控制磁场方向垂直纸面向外，二极管的右端为光输入端2，其左端为光输出端1，光二极管将从端口2到端口1导通。第一吸波层5和第二吸波层6为相同或不同的吸波材料，吸波材料为聚氨酯、石墨、石墨烯、炭黑、碳纤维环氧树脂混合体、石墨热塑性材料混合体、硼纤维环氧树脂混合体、石墨纤维环氧树脂混合体、环氧聚硫、硅橡胶、尿烷、氟弹性体、聚醚醚酮、聚醚砜、聚芳砜或者聚乙烯亚胺；第一吸波层5和第二吸波层6均分别与波导表面之间的距离w1为1/4至1/2波长；第一吸波层5和第二吸波层6的厚度均分别不小于1/4波长。
磁光材料与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)。
本发为无泄漏磁光材料薄膜波导磁表面快波光二极管，该器件是基于磁光材料所具有的非互易性，结合磁光材料-介质界面能够产生表面波的特性所研究出的具有优异性能的光二极管和隔离器。该器件通过磁光材料提供偏置静磁场，磁光材料薄膜设置于背景介质中和吸波层的组合，使得磁光材料-介质界面产生的磁表面快波来进行光的 单向传输，利用电流方向可控的电磁铁来控制光二极管的导通方向。同时，吸波层吸收无用波，消除光路干扰。
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：
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：
Figure PCTCN2017099820-appb-000001
磁导率张量的矩阵元由以下方程组给出：
Figure PCTCN2017099820-appb-000002
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。
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：
Figure PCTCN2017099820-appb-000003
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：
Figure PCTCN2017099820-appb-000004
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：
Figure PCTCN2017099820-appb-000005
其中，
Figure PCTCN2017099820-appb-000006
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)。而从方程的解可以得出，当改变磁场为反向时，光二极管的导通方向也变为相反方向。
可见，在磁光材料薄膜3处加入偏置磁场，并且由电流控制电磁铁磁场方向，并使用普通介质材料或、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4为空气(n0＝1)，磁光薄膜3的偏置磁场大小为900Oe，磁光薄膜3的尺寸长l＝50mm，厚w＝22.5mm，第一吸波层5和第二吸波层6均分别与波导之间的距离为w1＝5mm，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。磁光材料薄膜3所加的磁场垂直纸面向里，当光波从端口1输入时，在磁光材 料与介质界面产生单向正向传输的磁表面波，最后从光波端口2输出，即方向可控二极管向右单向导通；当光波从端口2输入时，由于磁表面波的非互易性导致光波无法在器件内部反向传输，从而无法从输出端口1输出。输出端口1没有任何光波输出，光能量已全部在输入端口2处被阻挡。光二极管的导通方向由外加磁场的方向所决定，如图3所示，采用钇铁石榴石(YIG)作为磁各向异性材料，背景介质4为空气(n0＝1)，磁光薄膜3的偏置磁场大小为900Oe，偏置磁场方向为垂直纸面向外，磁光薄膜3的尺寸长l＝50mm，其厚度w＝22.5mm，第一吸波层5和第二吸波层6均分别与波导之间的距离为w1＝5mm，YIG材料损耗系数α＝3×10-4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。磁场方向垂直纸面向外，二极管的导通方向是相反的。当光波从端口1输入时，由于器件的非互易性导致其内部无法传播反向的光波，输出端口2没有任何光波输出，光能量已全部在输出端口1处被阻挡；当光波从端口2输入时，光波能够在器件内部产生磁表面波，继而从输出端口1输出，即方向可控二极管向右单向导通。
本发明无泄漏磁光薄膜磁表面快波光二极管采用磁光材料薄膜设置于背景介质材料中，磁光材料薄膜3的尺寸长度l和厚度w可以灵活地根据实际工作波长和实际需求进行选择。改变尺寸对器件性能无大的影响。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，磁光材料薄膜厚度为w，第一吸波层5和第二吸波 层6均分别与波导之间的距离为w1＝5mm，YIG材料损耗系数α＝3×10-4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。
实施例1
参照图1(a)和(b)，磁表面快波方向可控光二极管由磁光薄膜3设置于背景介质4中构成，背景介质4为空气(n0＝1)，磁光薄膜厚度为w＝5mm。在工作频段内，通过电磁铁电流控制磁光材料外加磁场方向垂直纸面向里，光二极管将从输入端口1到输出端口2导通；相反，控制磁场方向垂直纸面向外，光二极管将从输入端口2到输出端口1导通。此两种情况的正反向传输效率相同。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5.00GHz～7.41GHz。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29.1dB，正向传输插入损耗为0.0079dB。
实施例2
参照图1，磁表面快波方向可控光二极管由磁光薄膜3设置于背景介质4中构成，背景介质4为空气(n0＝1)，磁光薄膜的厚度为w＝7mm。在工作频段内，通过电磁铁电流控制磁光材料外加磁场方向垂直纸面向里，光二极管将从端口1到端口2导通；相反，控制磁场方向垂直纸面向外，光二极管将从端口2到端口1导通。此两种情况的正反向传输效率相同。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5.00GHz～7.41GHz。在工作频率范围内，考虑材料损耗，光二极管和隔离器最高能达到正反向传输隔离度为31.0dB， 正向传输插入损耗为0.0082dB。
实施例3
参照图1，磁表面快波方向可控光二极管由磁光薄膜3设置于背景介质4中构成，背景介质4为玻璃(n0＝1.5)，磁光薄膜厚度为w＝5mm。在工作频段内，通过电磁铁电流控制磁光材料外加磁场方向垂直纸面向里，光二极管将从端口1到端口2导通；相反，控制磁场方向垂直纸面向外，光二极管将从端口2到端口1导通。此两种情况的正反向传输效率相同。参照图6，直波导结构的光二极管和隔离器的工作频率范围是5.00GHz～7.41GHz。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22.1dB，正向传输插入损耗为0.0399dB。
由图4、图5和图6不同参数的磁光薄膜磁表面快波方向可控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，即方向可控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方向可控光二极管是能够有效工作的。
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。

Claims (10)

  1. 一种无泄漏磁光薄膜磁表面快波方向可控光二极管，其特征在于：其包括一个光输入端口、一个光输出端口、一个磁光薄膜、背景介质、两个吸波层和一个可控偏置磁场；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口或光输出端口，其右端为光输出端口或光输入端口；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可控偏置磁场。
  2. 按照权利要求1所述的无泄漏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。
  3. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,其特征在于：所述光二极管由磁光材料与背景介质的分界面构成光波导可单向传输光信号。
  4. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,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；所述直波导为TE工作模式波导。
  5. 按照权利要求4所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,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。
  6. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,其特征在于：所述背景介质材料为工作波透明的材料。
  7. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控 光二极管，其特征在于：所述背景介质为普通介质材料、空气或玻璃。
  8. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,其特征在于：所述吸波层为相同或不同的吸波材料；所述吸波材料为聚氨酯、石墨、石墨烯、炭黑、碳纤维环氧树脂混合体、石墨热塑性材料混合体、硼纤维环氧树脂混合体、石墨纤维环氧树脂混合体、环氧聚硫、硅橡胶、尿烷、氟弹性体、聚醚醚酮、聚醚砜、聚芳砜或者聚乙烯亚胺。
  9. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,其特征在于：所述两个吸波层均分别与所述直波导表面的距离为1/4至1/2波长；所述两个吸波层的厚度均分别不小于1/4波长。
  10. 按照权利要求1所述的无泄漏磁光薄膜磁表面快波方向可控光二极管,其特征在于：所述偏置磁场由电流方向可控电磁铁或永久磁铁产生，永久磁铁能旋转。
PCT/CN2017/099820 2016-08-31 2017-08-31 无泄漏磁光薄膜磁表面快波方向可控光二极管 Ceased WO2018041183A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610798713.6 2016-08-31
CN201610798713.6A CN106405885A (zh) 2016-08-31 2016-08-31 无泄漏磁光薄膜磁表面快波方向可控光二极管

Publications (1)

Publication Number Publication Date
WO2018041183A1 true WO2018041183A1 (zh) 2018-03-08

Family

ID=58002082

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/099820 Ceased WO2018041183A1 (zh) 2016-08-31 2017-08-31 无泄漏磁光薄膜磁表面快波方向可控光二极管

Country Status (2)

Country Link
CN (1) CN106405885A (zh)
WO (1) WO2018041183A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106405885A (zh) * 2016-08-31 2017-02-15 欧阳征标 无泄漏磁光薄膜磁表面快波方向可控光二极管
CN106226925A (zh) * 2016-08-31 2016-12-14 欧阳征标 无泄漏磁光薄膜磁表面快波光二极管
CN106249443A (zh) * 2016-08-31 2016-12-21 欧阳征标 磁光薄膜磁表面快波方向可控光二极管

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1102285A2 (en) * 1999-10-27 2001-05-23 Minebea Co., Ltd. Magneto-optical member
CN101261372A (zh) * 2008-04-16 2008-09-10 浙江大学 一种偏振无关磁光波导光隔离器
CN101788720A (zh) * 2010-03-03 2010-07-28 成都优博创技术有限公司 一种光隔离方法和装置
US20110158578A1 (en) * 2008-08-27 2011-06-30 Hideki Yokoi Method for manufacturing optical nonreciprocal element, and optical nonreciprocal element
CN103891068A (zh) * 2011-10-20 2014-06-25 阿尔卡特朗讯 包括光隔离器的集成式光结构
CN106226925A (zh) * 2016-08-31 2016-12-14 欧阳征标 无泄漏磁光薄膜磁表面快波光二极管
CN106405885A (zh) * 2016-08-31 2017-02-15 欧阳征标 无泄漏磁光薄膜磁表面快波方向可控光二极管

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205427370U (zh) * 2016-02-03 2016-08-03 深圳市镭神智能系统有限公司 一种光隔离器
CN105842883A (zh) * 2016-05-12 2016-08-10 深圳市芯思杰智慧传感技术有限公司 光隔离器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1102285A2 (en) * 1999-10-27 2001-05-23 Minebea Co., Ltd. Magneto-optical member
CN101261372A (zh) * 2008-04-16 2008-09-10 浙江大学 一种偏振无关磁光波导光隔离器
US20110158578A1 (en) * 2008-08-27 2011-06-30 Hideki Yokoi Method for manufacturing optical nonreciprocal element, and optical nonreciprocal element
CN101788720A (zh) * 2010-03-03 2010-07-28 成都优博创技术有限公司 一种光隔离方法和装置
CN103891068A (zh) * 2011-10-20 2014-06-25 阿尔卡特朗讯 包括光隔离器的集成式光结构
CN106226925A (zh) * 2016-08-31 2016-12-14 欧阳征标 无泄漏磁光薄膜磁表面快波光二极管
CN106405885A (zh) * 2016-08-31 2017-02-15 欧阳征标 无泄漏磁光薄膜磁表面快波方向可控光二极管

Also Published As

Publication number Publication date
CN106405885A (zh) 2017-02-15

Similar Documents

Publication Publication Date Title
US6580546B2 (en) Faraday rotator
CN103278943B (zh) 一种适用于大功率光隔离器的法拉第旋转器
WO2018041185A1 (zh) 低损型磁光薄膜磁表面快模任意角单向拐弯波导
WO2018041183A1 (zh) 无泄漏磁光薄膜磁表面快波方向可控光二极管
WO2018041173A1 (zh) 无泄漏低损磁光薄膜磁表面快模可控单向任意拐弯波导
WO2018041189A1 (zh) 无泄漏低损型磁光空隙磁表面快模任意角单向拐弯波导
WO2018041184A1 (zh) 无泄漏磁光薄膜磁表面快波光二极管
CN110058431A (zh) 太赫兹超表面磁光克尔偏振转换器
WO2018041179A1 (zh) 无泄漏磁光材料空隙波导磁表面快波光二极管
WO2018041175A1 (zh) 无泄漏低损型磁光薄膜磁表面快模任意角单向拐弯波导
CN106291812B (zh) 低损磁光薄膜磁表面快模任意方向可控单向拐弯波导
WO2018041178A1 (zh) 低损磁光空隙磁表面快模任意方向可控单向拐弯波导
WO2018041180A1 (zh) 无泄漏磁光材料空隙波导磁表面快波方向可控光二极管
WO2018041176A1 (zh) 磁光材料空隙波导磁表面快波方向可控光二极管
WO2018041182A1 (zh) 磁光材料空隙波导磁表面快波光二极管
CN106200026B (zh) 无泄漏低损磁光空隙磁表面快模可控单向任意拐弯波导
US3860325A (en) Electric field displacing type optical isolator
WO2018041181A1 (zh) 磁光薄膜磁表面快波方向可控光二极管
WO2018041174A1 (zh) 磁光薄膜磁表面快波光二极管
Levy et al. Permanent magnet film magneto‐optic waveguide isolator
CN106249352B (zh) 低损型磁光空隙磁表面快模任意角单向拐弯波导
CN210428000U (zh) 一种基于磁光介质与pt对称结构的多通道信号选择器
CN219843149U (zh) 一种双极化非对称传输、吸波超材料结构
TAKI et al. Nonreciprocal properties of waveguide-type mono-sectional optical isolators using Bi: YIG thin-films
Rao et al. Design of One-way Structure for Spatial EM Wave Based on the Magnetic Surface Plasmon States

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17845485

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205 DATED 06/08/2019)

122 Ep: pct application non-entry in european phase

Ref document number: 17845485

Country of ref document: EP

Kind code of ref document: A1