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在完整的二维光子晶体中引入线缺陷,形成了光子晶体波导。设计了一种二维光子晶体三通道分束器,采用时域有限差分方法(FDTD),从理论上计算该器件3个通道电磁波的透射率。为了提高电磁波的透射率,通过在波导附近调节介质柱半径,引入两组点缺陷。结果表明,两组点缺陷的介质柱半径选择合适的值,在3个通道中可以得到最佳的电磁波透射率。
In the complete two-dimensional photonic crystal line defects introduced to form a photonic crystal waveguide. A two-dimensional photonic crystal three-channel beamsplitter was designed. The time-domain finite difference method (FDTD) was used to theoretically calculate the transmittance of three channels of the device. In order to increase the transmission of electromagnetic waves, two sets of point defects are introduced by adjusting the radius of the dielectric column near the waveguide. The results show that the optimal values of electromagnetic wave transmittance can be obtained in the three channels by selecting suitable values of the dielectric column radii for two sets of point defects.