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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 aresimulated and theoretically investigated by finite difference time domain(FDTD) and coupled mode theory (CMT) method. The results show that changing thenumber and position of resonant cavities can adjust the transmissioncharacteristics of the filter. The minimum transmission and sensitivity of thisfilter is 0.19% and 1149 nm/RIU, respectively. The filters have broad prospectsin the highly integrated optical circuits and refractive index sensor.

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