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为了提高异质结构光子晶体环形腔滤波器的滤波特性,采用粒子群(PSO)算法对其结构参数进行全局优化.以正方晶格光子晶体环形滤波器结构为优化对象,根据粒子群算法的位置——速度更新公式,对光子晶体缺陷处散射柱、耦合介质柱和内部介质柱的半径进行全局优化.通过理论分析和数值模拟结果可以看出,滤波结构参数优化后,可实现单模窄带滤波.与此同时,归一化透射率由53%提高到97%,证明了该优化算法的有效性,从而为该滤波结构在光电器件中的应用奠定了基础.
In order to improve the filtering characteristics of the heterostructure photonic crystal circular cavity filter, the particle swarm optimization (PSO) algorithm is used to optimize its structural parameters globally. The square lattice photonic crystal ring filter structure is optimized. According to the particle swarm optimization - velocity update formula to optimize the radius of the scattering column, the coupling medium column and the inner dielectric column in the photonic crystal defect. Through the theoretical analysis and numerical simulation results, it can be seen that the filtering structure parameters can be optimized to achieve single-mode narrow-band filtering At the same time, the normalized transmittance increased from 53% to 97%, which proves the effectiveness of the optimization algorithm, which lays the foundation for the application of the filter structure in optoelectronic devices.