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Numerical research on characteristics of a teeth-shaped nanoplasmonic waveguide filter

Transmittance spectra of double-sided teeth-shaped nanoplasmonic waveguide filters formed in the metal-insulator-metal (MIM) waveguides are systematically investigated. It is found that a staggered double-sided teeth-shaped structure exhibits a wide and sharp bandgap, furthermore the two staggered double teeths combination can realize the narrow band filter with ultracompact size in the length of a few hundred nanometers. The finite element method is employed in the simulations. Our results may open a way to construct nanoscale waveguide filters for high-density nanoplasmonic integration circuits.