Plasmonic Band-stop MIM Waveguide Filter Based on Bilateral Asymmetric Equilateral Triangular Ring

TL;DR

This paper proposes a novel plasmonic band-stop filter using a bilateral asymmetric equilateral triangular ring in MIM waveguides, with tunable transmission properties suitable for integrated optics and sensing applications.

Contribution

It introduces a new bilateral asymmetric triangular ring design for MIM waveguide filters, demonstrating tunable spectral characteristics through cavity modifications.

Findings

Minimum transmission of 0.19% achieved

Sensitivity of 1149 nm/RIU demonstrated

Transmission characteristics can be adjusted by cavity configuration

Abstract

In this paper, a bilateral asymmetric equilateral triangular ring (ETR) band-stop filter based on metal-insulator-metal (MIM) waveguide is proposed. The transmission spectrum and electric field distribution of the filter are simulated and theoretically investigated by finite difference time domain (FDTD) and coupled mode theory (CMT) method. The results show that changing the number and position of resonant cavities can adjust the transmission characteristics of the filter. The minimum transmission and sensitivity of this filter is 0.19% and 1149 nm/RIU, respectively. The filters have broad prospects in the highly integrated optical circuits and refractive index sensor.