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采用平面波展开法和时域有限差分法,对GaAs二维正方晶格光子晶体的色散特性和带隙结构进行了数值模拟研究,并对GaAs二维光子晶体线缺陷构成的T型波导分支器的微波传输特性进行了模拟和优化。数值模拟结果表明,光子晶体填充比对带隙结构有显著地影响。通过在拐角处插入额外的电介质棒对GaAs二维正方光子晶体T型波导分支器进行优化,数值模拟的结果表明,优化的GaAs二维正方光子晶体T型波导分支器在一阶带隙范围内透射系数将提高到0.96以上。
The dispersion characteristics and band gap structure of GaAs two-dimensional square lattice photonic crystal were numerically simulated by the plane wave expansion method and the finite-difference time-domain method. The GaAs two- Microwave transmission characteristics were simulated and optimized. Numerical simulation results show that the photonic crystal filling ratio has a significant effect on the band gap structure. The GaAs two-dimensional square photonic crystal T-waveguide splitter is optimized by inserting an extra dielectric rod at the corner. The numerical simulation results show that the optimized GaAs two-dimensional square photonic crystal T-waveguide splitter has a better performance in the first-order band gap Transmission coefficient will be increased to more than 0.96.