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Theoretical Analysis of Lattice-Mediated Plasmon Resonance Using Finite-Difference Time-Domain Method
摘要： Although much progress has been made on lattice plasmon mode (LPM), there is still a lack of systematic studies on LPM generation; questions remain unanswered on topics such as high-order LPM generation, LPM generation from near-coupling complex elements, and modulation of incidence energy. Here, we systematically evaluated the properties of multiple high-order LPM, energy flow modulation of incident polarization, element, angle of incidence, and hybrid of dual lattice using the finite-difference time-domain method. This study presents a clear illustration of LPM and will help on further development of LPM and plasmonics-based fields.
关键词： Plasmonics,Finite-Difference Time-Domain Method,Lattice Plasmon Mode,Localized Surface Plasmon Resonance
更新于2025-09-04 15:30:14
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Asymmetric light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure
摘要： In this paper, we present the numerical and experimental demonstration of asymmetric light transmission by a compact photonic crystal (PC) structure, which sustains semi-Dirac cone dispersion. The semi-Dirac point is obtained by exploiting plane-wave expansion method in a rectangular unit cell of a cylindrical dielectric rod, forming a PC structure. The preselected part of the corresponding PC structure is optimized via differential evolution to maximize the transmission efficiency in one direction, and to minimize in the opposite direction. In this regard, finite-difference time-domain method is integrated with the optimization algorithm to numerically design a compact PC structure with asymmetric light transmission effect. The detailed numerical investigation of the optimized PC structure is represented, and the experiments in the microwave regime are performed to verify the numerical results. The experimentally measured transmission efficiency reaches 78% for one direction, whereas in the opposite direction it reduces to 11%. The physical mechanism of asymmetric light transmission is related to differences of the projection of the wave incident from both directions into the eigenmodes of the photonic structure.
关键词： asymmetric light transmission,semi-Dirac cone dispersion,photonic crystal,differential evolution,finite-difference time-domain method
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Resonance Frequency Inversion of Cold Unmagnetized Plasma Based on CDLT-FDTD and PSO Methods
摘要： Current density Laplace finite-difference time-domain (CDLT-FDTD) method conjunction with particle swarm optimization (PSO) method is introduced to reconstruct the resonance frequency of cold unmagnetized plasma medium. During the inversion, the resonance frequency of the plasma is reconstructed by Fourier series expansion method and the traditional direct method, respectively. The simulation results show that the Fourier series expansion method has better reconstruction accuracy than the traditional direct method, and the number of unknowns is only 1/3 of that of the traditional direct method.
关键词： finite-difference time-domain method,Fourier series expansion,particle swarm optimization,Current density Laplace transform
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Graphene Based Absorber Using LTJEC FDTD
摘要： A terahertz absorber using graphene is simulated using Laplace transform current density convolution finite difference time domain method. An absorber with approximately unity absorption is designed with a graphene ribbon array and a graphene sheet. The numerical results are presented to validate the proposed structure and demonstrate that the graphene sheet is an appropriate material to develop a broadband absorber.
关键词： Graphene,Broadband absorber,Finite difference time domain method,Laplace transform
更新于2025-09-04 15:30:14