Experimental and numerical study of a broad pass-band resonant optical metamaterials filter

A broad pass-band metamaterials-based optical filter is experimentally and numerically studied. The designed structure is constructed from a metal-dielectric-metal (MDM) sandwiched array. Measured results indicate that a broad pass-band can be achieved over 96.8% transmittance frequency range from 147.4 THz to 155.0 THz. Electrical field distributions indicate that the coupling and interaction between internal surface plasmon polariton (internal SPP) and localized surface plasmon (LSP) modes between silver layer and SU-8 layer leads to the broad pass-band. The influence of thickness of dielectric layer, the geometrical sizes of the cross hole ( arm width W and arm length L) is experimentally examined. Finally, effects of variation of permittivity εd of dielectric layer are numerically surveyed. The compound structure metamaterials-based optical filter is demonstrated to have high tolerance to these parameters.