基于锚形谐振腔的等离子体波导特性研究

Study on characteristics of plasma waveguide based on anchored cavity

摘要:

摘要：基于表面等离子体激元（SPPs）在金属/介质/金属（MIM）结构中优良的传输特性，设计了一种由直波导和锚形谐振腔组成的波导滤波器。使用有限元法研究其传输特性和电场分布随结构参数和谐振腔内介质折射率变化规律，并利用COMSOL Multiphysics软件进行仿真，结果表明，该锚形谐振腔最佳结构时滤波器半峰全宽（FWHM）低至8nm，品质因数（Q）高达121.9。利用共振波长与结构参数变化规律，设计了光通信波长窗口的窄带带阻滤波器。 根据SPPs对谐振腔介质折射率敏感的特性，得到透射谱线随折射率变大而发生红移的规律。本文提出了基于锚形谐振腔的等离子体MIM波导滤波器，为设计特定波长的窄带带阻滤波器提供了新思路，也为基于谱线红移特性设计的介质折射率传感器提供了技术支持。

Abstract:

Abstract:Based on the excellent transmission characteristics of surface plasmon polaritons (SPPs) in metal / dielectric / metal (MIM) structures, a waveguide filter composed of a straight waveguide and an anchor resonator is designed.The finite element method is used to study the transmission characteristics and the variation of electric field distribution with the structural parameters and the refractive index of the medium in the resonator, and the simulation is carried out by using COMSOL multiphysics software. The results show that the FWHM of the filter is as low as 8nm and the quality factor (Q) is as high as 121.9.According to the sensitivity of SPPs to the refractive index of the cavity medium, the rule that the transmission line redshifts with the increase of the refractive index is obtained. A narrow band stop filter for optical communication wavelength window is designed based on the variation of resonant wavelength and structural parameters.In this paper, a plasma MIM waveguide filter based on an anchor resonator is proposed, which provides a new idea for the design of a narrow band stop filter with a specific wavelength, and also provides technical support for the design of a dielectric refractive index sensor based on the red shift characteristics of spectral lines.