Numerical and experimental verification of transmission enhancement through double fishnet structure metamaterials

Transmission enhancement is an interesting phenomenon. Many factors play important role in transmission enhancement, such as extraordinary optical transmission (EOT), structural optimization, hole shape, filler, and so on. In this paper, a metal/dielectric/metal (MDM) double fishnet structure metamaterial is proposed and measured. Measured result indicates that the transmission of the proposed structure is enhanced compared to the single fishnet structure. The electric field intensity distribution calculation results show that the strong vertical coupling resonance effect of local surface plasma (LSP) modes leads to the enhancement of transmittance and the appearance of the transmission band. The effect of structural design on the transmission is also measured. Finally, the transmission enhancement phenomenon is also can be found in four structural designs metamaterial in simulation.