Angle-tolerant hybrid plasmonic blue filter with polarization-insensitivity and high transmission

Abstract

The optical blue filter with the suitable bandwidth, high transmittance and large acceptance angle is usually regarded as a critical optical component for a variety of applications. Here, we propose a polarization-insensitive angle-tolerant hybrid plasmonic blue filter incorporating two-dimensional aluminum (Al) nanodisks on the top of planar waveguide. The proposed plasmonic filter works via hybridization of surface plasmon polariton (SPP) mode, the localized Fabry–Perot resonance and waveguide mode, thus enables high peak transmittance up to 70% with the bandwidth of 30 nm and large acceptance angle up to 20°.