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Communications in Theoretical Physics 2022年第11期74卷 170-179页

作者： Xianwen Zhou Yiping Xu Yuhui Li Shubo Cheng Zao Yi Guohui Xiao Ziyi Wang Zhanyu Chen School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China Jiangxi Province Key Laboratory of Optoelectronics and Communications Jiangxi Science and Technology Normal UniversityNanchang 330038China

We propose a novel bilayer graphene terahertz metamaterial composed of double graphene ribbons and double graphene rings to excite a dynamically adjustable triple plasma-induced transparency(PIT)*** coupled mode theory(CMT)is used to explain the PIT phenomenon,and the results of the CMT and the finite-difference time-domain simulation show high matching *** adjusting the Fermi levels of graphene,we have realized a pentafrequency asynchronous optical *** performance of this switch,which is mainly manifested in the maximum modulation depth(MD=99.97%)and the minimum insertion loss(IL=0.33 dB),is *** addition,we have studied the slow-light effect of this triple-PIT and found that when the Fermi level of graphene reaches 1.2 eV,the time delay can reach ***,this metamaterial provides a foundation for the research of multi-frequency optical switches and excellent slow-light devices in the terahertz band.

关键词： plasma-induced transparency coupled mode theory optical switch slow-light effect

High-sensitive refractive index sensing and excellent slow light based on tunable triple plasmon-induced transparency in monolayer graphene based metamaterial

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Communications in Theoretical Physics 2023年第1期75卷 120-129页

A patterned monolayer graphene metamaterial structure consisting of six graphene blocks and two graphene strips is proposed to generate triple plasmon-induced transparency(PIT).TriplePIT can be effectively modulated by Fermi levels of *** theoretically calculated results by coupled mode theory show a high matching degree with the numerically simulated results by finite-difference ***,the high-sensitive refractive index sensing and excellent slow-light performance can be realized in the proposed graphene metamaterial *** sensitivity(S)and figure of merit can reach up to 5.7115 THz RIU^(-1)and 116.32,***,the maximum group refractive index is ***,these results may provide a new idea for designing graphene-based sensors and slow light devices.

关键词： plasma-induced transparency coupled mode theory graphene refractive index sensor slow-light effect

Microring-Assisted Coupling Between Dissimilar Waveguides

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Tsinghua Science and Technology 2010年第2期15卷 145-150页

作者： V. Van P.-T. Ho Department of Electrical and Computer Engineering University of Alberta Department of Electronic Engineering Univer-sity of Maryland College Park Department of Electronic Engineering Tsinghua University

The use of microdng resonators to assist in the evanescent field coupling between dissimilar waveguides is proposed and analyzed. Theoretical analysis based on the coupled mode theory and numerical example show that complete cross power transfers can be obtained near the microring resonances. Applications of the device include power dividers, low-power thermo-optic or electro-optic switches, and modulators.

关键词： microring resonators microring-assisted coupling resonance-assisted coupling coupled mode theory

TE mode Mixing Dynamics in Curved Multimode OpticalWaveguides

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Communications in Computational Physics 2012年第2期11卷 525-540页

作者： Emmanuel Perrey-Debain I.David Abrahams Laboratoire Roberval Universite de Technologie de Compi`egne 60205 Compi`egne BP 20529France School of Mathematics University of ManchesterOxford RoadManchesterM139PLEnglandU.K.

Propagation of light through curved graded index optical waveguides supporting an arbitrary high number of modes is *** discussion is restricted to optical wave fields which are well confined within the core region and losses through radiation are *** coupled mode theory formalism,two new forms for the propagation kernel for the transverse electric(TE)wave as it travels along a curved two-dimensional waveguide are *** form,involving the notion of“bend”modes,is shown to be attractive from a computational point of view as it allows an efficient numerical evaluation of the optical field for sharply bent waveguides.

关键词： Curved waveguides coupled mode theory harmonic oscillator

Time Symmetry Analysis of Nonlinear Parity Based on S-P Compensation Network Structure

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Instrumentation 2022年第1期9卷 49-55页

作者： XIAO Weihao HUANG Xuhong School of Electrical Electrical and PhysicsFujian University of TechnologyFuzhouFujian 350000

The wireless power transmission system based on nonlinear parity time symmetry is a robust sys-tem that can maintain high-efficiency transmission at a certain ***-Time Symmetry(PT symmetry)wireless power transfer system,due to its insensitivity to the position of the coupled resonant coil over a large range,can carry out constant power transfer to the load,and through coupled mode theory The PT symmetrical wireless power transmission circuit with S-P structure is analyzed,and the system has different transmission efficiencies in different coupling intervals,and the transmission effect of the structure at different distances is studied with the change of coupling ***,the simulation is carried out by MATLAB and origin *** final results show that the transmission efficiency does not change with the coupling coefficient in the strong coupling region and can maintain high-efficiency *** the weak coupling region,the coupling coefficient has a great influence on the transmission efficiency of the system.

关键词： Parity Time Symmetry Wireless Energy Transfer S-P Type Structure coupled mode theory

Effects of Three Coupling Coefficients on the Spectrum Characteristics of Superstructure Fiber Grating

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Wuhan University Journal of Natural Sciences 2009年第4期14卷 333-337页

作者： YUAN Yinquan,GUO Zhenqiang, WEN Xiaoyan Key Laboratory of Fiber Optic Sensing Technology and Information Processing of Ministry of Education,Wuhan University of Technology,Wuhan 430070,Hubei,China Key Laboratory of Fiber Optic Sensing Technology and Information Processing of Ministry of Education Wuhan University of Technology Wuhan 430070 Hubei China

For the superstructure fiber grating （SFG） consisting of fiber Bragg grating （FBG） and long-period fiber grating （LPFG）, there exist three kinds of coupling： the contra-directional coupling between forward propagating core mode and backward propagating core mode, the contra-directional coupling between core mode and cladding mode, and the co-directional coupling between core mode and cladding mode. By using the similarity transformation method for the coupled mode equations, the effects of three coupling coefficients κcoL, κclL, and κsL on the transmission and re- flection spectra of SFG have been investigated. The simulations show that the overall intensity of the transmission spectrum of SFG is decided by LPFG, that the main lobes of the transmission and reflectivity spectra of SFG are decided by coupling coefficients κcoL and κsL, and that the side lobes of the transmission and reflectivity spectra are decided by coupling coefficients κclL and κsL.

关键词： superstructure fiber grating coupled mode theory coupling coefficient

Dynamic phase transition region in electrically injected PT-symmetric lasers

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Photonics Research 2024年第11期12卷 2539-2548页

作者： YANG CHEN YUFEI WANG JINGXUAN CHEN TING FU GUANGLIANG SUN ZIYUAN LIAO HAIYANG JI YINGQIU DAI WANHUA ZHENG Laboratory of Solid State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences College of Future Technology University of Chinese Academy of Sciences Weifang Academy of Advanced Opto-electronic Circuits State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences

Research on parity-time(PT) symmetry and exceptional points in non-Hermitian laser systems has been extensively conducted. However, in practical electrically injected PT-symmetric lasers, the frequency detuning and linewidth enhancement factor of the laser can influence the symmetry breaking of the system in another dimension. We find that the previous exceptional point now transforms into a dynamic phase transition region, where the states are temporally unstable, indicating the occurrence of multimode oscillation.

关键词： coupled mode theory Laser applications Laser arrays Laser systems Scanning electron microscopy Semiconductor lasers

Waveguide-resonator coupling structure design in the lithium niobate on insulator forχ^((2))nonlinear applications

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Chinese Optics Letters 2023年第5期21卷 37-41页

作者：成珊珊贾琨鹏张弛田晓慧谢臻达祝世宁 National Laboratory of Solid State Microstructures School of Electronic Science and EngineeringSchool of PhysicsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The microring resonator based on lithium niobate on insulator(LNOI)is a promising platform for broadband nonlinearity process because of its strong second-order nonlinear coefficients,the capability of dispersion engineering,*** is important to control the energy transmitted into the resonator at different wavelengths,as this becomes difficult for two bands across an *** this Letter,we study the effect of different pulley bus-resonator configurations on phase mismatching and mode field *** achieve the control of energy transmission coefficients at different wavebands simultaneously and provide a general design methodology for coupled structures for broadband *** paper can contribute to quantum and classical optical broadband applications based on LNOI microring resonators.

关键词： lithium niobate on insulator broadband pulley bus waveguide coupled mode theory

Calculation of the Coupling Coefficient of Twin-Core Fiber Based on the Supermode theory with Finite Element Method

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Optics and Photonics Journal 2021年第8期11卷 402-411页

作者： Tianhao Zhao Wenhua Ren Tingya Yin Fan Wang Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing China

Currently, coupled mode theory (CMT) is widely used for calculating the coupling coefficient of twin-core fibers (TCFs) that are used in a broad range of important applications. This approach is highly accurate for scenarios with weak coupling between the cores but shows significant errors in the strong coupling scenarios, necessitating the use of a more accurate method for coupling coefficient calculations. Therefore, in this work, we calculate the coupling coefficients of TCFs using the supermode theory with finite element method (FEM) that has higher accuracy than CMT, particularly for the strong coupling TCF. To investigate the origin of the differences between the results obtained by these two methods, the modal field distributions of the supermodes of TCF are simulated and analyzed in detail.

关键词： Coupling Coefficient Twin-Core Fiber Supermode theory Finite Element Method coupled mode theory

Characteristics of Multiply π Phase shifted Long period Fiber Gratings

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Chinese Journal of Lasers 2001年第1期 73-77页

作者： ZHU Songlin ZHANG Xianmin CHEN Kangsheng (Department of Information & Electronic Engineering, Zhejiang University, Hangzhou 310027, China) Received March 3, 2000 Revised manuscript received May 12, 2000

The transmission spectra of multiply π phase shifted long period fiber gratings (LPFG’s) are analyzed by a combination of coupled mode theory and the fundamental matrix method. The theoretical simulation shows that the LPFG’s can act as novel bandpass filters with two dominant pass bands when multiple π phase shifts are introduced at particular locations along the grating.

关键词： long period fiber grating coupled mode theory fundamental matrix