边界耦合斜对称双矩形环金属-绝缘体-金属结构滤波器与电光开关的设计

Design of Boundary Coupled Oblique Symmetric Double Rectangular Ring Metal-Insulator-Metal Structural Filter and Electro-Optic Switch

基于表面等离子激元构造了一种边界耦合模式的金属绝缘体金属结构滤波器,该滤波器由两个斜对称矩形环谐振腔及波导管所组成,采用有限元法对该滤波器进行仿真计算和分析,得到它的磁场分布图和透射谱线图。结果表明,该滤波器在通带部分的透射率最高可达0.969,阻带部分的透射率最低接近为0,同时还具有通带与阻带较宽、透射谱线平滑的特点。调节结构参数可使得透射谱线图发生红移或蓝移的现象,设置特定的结构参数可以实现在保持第一通信窗口通过的状态下,对第二、三通信窗口的通断进行选择性控制的功能,因此,该滤波器可作为一种带通/带阻滤波器,在高密度集成电路和光纤通信中有着非常重要的应用。另外通过结构的改进并加入电光材料DAST实现了一种电光开关的功能。

A metalinsulatormetal structural filter,which comprises two oblique symmetric rectangular ring resonant cavities and a waveguide,was built using a boundary coupling approach based on surface plasmon polaritons.A finite element method was employed to simulate and examine the filter,and the magnetic field distribution map and transmission curve were generated.The findings demonstrate that the filter’s maximum transmittance in the passband is 0.969,and its minimum transmittance in the stopband is close to 0.This filter also has a wide passband and stopband features,and a smooth transmission curve.The filter’s transmission curve can be redshifted or blueshifted by adjusting the structural parameters,and by setting certain structural parameters,the function of the onoff of the second and third communication windows of the filter can be controlled selectively while keeping the first communication window passing through.Thus,the filter can be employed as a bandpass/bandstop filter,which has crucial applications in highdensity integrated circuits and optical fiber communication.furthermore,an electrooptic switch function can be accomplished by enhancing the structure and adding the electrooptic material DAST.