Dual-wide band plasmonic filter based on nanocomposite media

A dual, wide band pass metal–insulator–metal plasmonic filter based on nanocomposite media in the near-infrared band, 0.75 to 2.5 μm wavelength range, is proposed. Simulation results show that the pass bands can be adjusted to proper ranges by changing the size of the device and the relative permittivity of the dielectric region. Due to the importance of small structures in optical integration, we focused on tuning the transmitted bands by changing the dielectric relative permittivity. Realization of any desired relative permittivity for the dielectric region may be difficult using general dielectrics. In this way, the dielectric region is designed based on nanocomposite media, which no previous studies have focused on. Dielectric region is realized by a polymeric medium, poly-methyl-methacrylate, that consists of random distribution of guest spherical silver nanoparticles. The proper permittivity and consequently, the desired pass bands are obtained by changing the fill fraction of guest nanoparticles.