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Transmittance spectrum of surface plasmon polariton based filter with asymmetric double-ring resonator and switch

The transmittance spectrum of a plasmonic filter has been numerically simulated by the two-dimension (2D) finite-difference time-domain method. The filter is composed of two Metal-Insulator-Metal waveguides and a resonator with two different rings. The results show that the rising edge of the asymmetric resonator is steeper than that of symmetric one at each pass band. By embedding the liquid crystal in the resonator, the filter can act as an electro-optical switch. These results show potential applications on nano-optical devices.