Plasmonic transmission color filters with narrow linewidth and enhanced out-of-band suppression

We investigate hybrid dielectric-metallic transmission color filters for cost-effective, narrow linewidth filters that are fully CMOS compatible. Through the interference of the resonance phenomena in a metallic hole array with a magnetic dipole resonance in a dielectric nanopillar, a narrow linewidth transmission window is opened. An additional metal cover on top of the pillar further suppresses transmission at longer wavelengths due to a localized surface plasmon polariton. FDTD simulations predict a transmission of over 50% and a linewidth of down to 25 nm for the green filter. The out-of-band suppression is lower compared to previously reported metal-insulator-metal filters.