Teeth-Shaped Waveguide-Driven Tunable Band-Stop Plasmonic Filter in the Near-Infrared Region

A tunable plasmonic filter in the near-infrared range is being investigated using the finite element numerical method (FEM). The filter structure consists of a serrated dielectric layer, which includes an air layer and silica teeth sandwiched between two metal layers. A numerical analysis shows that it is possible to adjust the band-stop amplitude, intensity, and band-pass width by changing the geometrical parameters. The proposed structure is expected to be used as an essential component of photonics devices due to its ability to confine light in the sub-wavelength region.