论文部分内容阅读
通过引入谐振腔,设计了一种具有较强透射特性的亚波长金属光栅。引入有耗Drude色散媒质模型,采用时域有限差分算法(Finite-Difference Time-Domain,FDTD),研究金属光栅的透射增强特性并分析了光栅几何参数对透射特性的影响。计算结果表明,所设计内壁刻有谐振腔的三层光栅比单层光栅具有更好的滤波效果,其透射光谱峰值可达84%,为带通滤波器的设计提供了参考。并利用波导Fabry-Perot(F-P)腔谐振效应分析了透射峰的漂移现象。
By introducing the resonant cavity, a subwavelength metal grating with strong transmissivity is designed. The lossy Drude dispersion media model is introduced, and the transmission enhancement characteristic of the metal grating is studied by Finite Difference Time-Domain (FDTD) method. The influence of grating geometry on the transmission characteristics is also analyzed. The calculation results show that the designed three-layer grating with the resonant cavity is better than the single layer grating with the peak of transmission spectrum reaching 84%, which provides a reference for the design of the band-pass filter. The transmission peak shift phenomenon was analyzed by using Fabry-Perot (F-P) cavity resonance effect.