High selective single mode plasmonic filters based on MIM coupled with pill resonator

A novel plasmonic filter has been proposed using MIM waveguide coupled with a HPF and a pill resonator. Basic structure through the study field profile and setting the output waveguide on the side of the cavity and implementing a HPF before the cavity, we were able to establish a single mode filter in the 500 nm to 1500 nm wavelength range with a transmission of 62% and FWHM=7 nm and Q-factor =95.14 and insertion loss of 2.076 dB. COMSOL Multiphysics software based on the FEM method has been used for the numerical investigation. The structure uses air and silver as dielectric and metal, respectively, and the silver is characterized by the Drude model. Taking into account the high transmission and selectivity with an ultra low spatial size, the proposed filter has a good potential to be used in more complex structures.