共查询到17条相似文献,搜索用时 125 毫秒
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将理想匹配层(PML)吸收边界条件和模式匹配法用于多段平面光波导结构分析,给出了一种改进的平面光波导结构的PML吸收边界条件,并对光波导的光场分布进行数值模拟,所得结果表明了PML吸收边界条件应用于多段平面光波导结构分析的有效性.该方法也可用于分析复杂结构的平面光波导. 相似文献
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PML—FDTD法在分析平面光波导结构中的应用 总被引:4,自引:2,他引:4
将理想匹配层(PML)吸收边界条件用于平面光波导结构的时域有限差分(FDTD)法分析中,给出了平面光波导结构的PML吸收边界条件,并对平行介质带定向耦合器进行数值模拟和验证,所得结果与理论值非常一致,证明了PML吸收边界条件应用于平面光波导结构分析的有效性。本文方法可用于分析任意复杂结构的平面光波导。 相似文献
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理想匹配层(PML)是近年来迅速发展起来的一种非常有效的吸收边界.本文基于模式匹配法将PML吸收边界条件用于平面光波导结构计算中,从理论上分析了PML吸收边界条件的有效性,并在PML边界条件下模拟计算了一个三段平面光波导结构的模场分布. 相似文献
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将理想匹配层(PML)吸收边界条件用于平面光波导结构的时域有限差分法(FDTD)分析,并对微腔体谐振环进行了数值计算模拟。证明了采用PML吸收边界条件的FDTD法应用于平面光波导结构分析的有效性。本方法对平面光波导的计算机辅助设计(CAD)具有实际意义,可用于分析任意复杂结构的平面光波导。 相似文献
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高阶FDTD法分析电-大尺寸光波导器件 总被引:8,自引:4,他引:4
高阶时域有限差分(FDTD)法用于电-大尺寸平面光波导器件的时域分析,实现了高阶FDTD法的理想匹配层(PML)吸收边界条件;研究了高阶FDTD法的数值色散特性,并对平行介质带定向耦合器进行了数值模拟,所得结果与解析解非常一致。 相似文献
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弯曲波导中基于PML边界条件的柱坐标广角BPM 总被引:2,自引:2,他引:0
给出了基于完美匹配层边界条件(PML—BC)的柱坐标广角波束传播方法(BPM)。用(2,2)阶Pade近似的广角BPM对光在弯曲波导中的传输特性进行了计算和分析,获得了比近轴BPM更精确的结果。采用了PML—BC,减小了边界反射,获得了比透明边界条件(TBC)更好的结果。 相似文献
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A high-performance absorbing boundary condition is newly developed for the reduction of spurious reflections in photonic crystal (PC) waveguide simulations. The PC waveguide is terminated with a perfectly matched layer (PML) in which the original PC structure remains as is. This PC-based PML works well, compared to a conventional PML, which acts as a homogeneous absorbing medium, simulating a semi-infinite free space and to a distributed-Bragg-reflector waveguide, which was recently developed to reduce reflections from PC waveguide ends, improving a wavenumber matching condition for PC waveguide modes 相似文献
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三维PML吸收边界条件在微带线不连续性问题分析中的应用 总被引:1,自引:1,他引:0
将完全匹配层(PML)吸收边界条件从求解二维TE/TM模问题推广到求解三维混合模传输线问题,通过对各种三维微带线不连续性结构散射特性的计算表明,文中给出的电磁PML吸收边界条件保持了二维情况下宽带、高精度的优点,在复杂结构的FDTD分析中具有重要的实用意义。 相似文献
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Perfectly matched layer (PML) boundary conditions are incorporated into the full-vectorial beam propagation method (BPM) based on a finite element scheme for the three-dimensional (3-D) anisotropic optical waveguide analysis. In the present approach, edge elements based on linear-tangential and quadratic-normal vector basis functions are used for the transverse field components. To show the validity and usefulness of this approach, numerical examples are shown for Gaussian beam propagation in proton-exchanged LiNbO3 optical waveguides. Numerical accuracy of the present PML boundary condition is investigated in detail by comparing the results with those of the conventional absorbing boundary condition (ABC) 相似文献
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Qin Weiping Fang Dagang 《电子科学学刊(英文版)》2001,18(4):297-305
The anisotropic Perfectly Matched Layer(PML) absorbing boundary condition is implemented in a 2-D finite element formulation to solve dielectric waveguide discontinuity problems. The choice of parameters of anisotropic PML has been investigated. Using the boundary truncating technique, the solution process of Finite-Element Method (FEM) has been greatly simplified compared with other hybrid methods. The required computational resources have also significantly declined since the anisotropic PML interface can be placed much closer to the scatterer compared to other well known artificial boundary. 相似文献
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Dan Zhang Hongting Jia Kiyotoshi Yasumoto 《Journal of Infrared, Millimeter and Terahertz Waves》2008,29(9):823-831
A problem of coupling between conventional dielectric waveguides and a two-dimensional photonic crystal waveguide is analyzed, using the Fourier series expansion method combined with the absorbing boundary condition of a perfectly matched layer (PML). A novel structure for the input and output ends of the photonic crystal waveguide is proposed to increase the coupling efficiency. Numerical examples are demonstrated and discussed to validate the effectiveness of the proposed structure. 相似文献
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PML吸收边界的时域有限差分法的数值色散研究 总被引:1,自引:1,他引:0
PML吸收边界以其优异的吸收能力与效果而倍受人们的关注。本文针对运用PML吸收边界的时域有限差分法的数值色散问题进行了研究,并得到了较为满意的结果,PML吸收边界在有效减少电磁 波在边界上的反射的情况下,并没有带来对数值色 散的不良影响。 相似文献