Abstract
The transmission of linearly polarized plane wave through cascaded metal films perforated with periodic hole arrays is investigated by using the three-dimensional finite-difference time-domain method. The results show that the transmission spectra can be controlled by changing the longitudinal interval G and/or the lateral displacements Lx and Ly, which are parallel and perpendicular to the polarization direction of the incident light, respectively. The variation in longitudinal interval G results in a redshift or blueshift of the transmission peak due to the coupling of the localized surface plasmon (LSP) modes on two metal layers. The lateral displacement Lx leads to the splitting of the transmission peak, originating from the variation in the coupling manner of LSP modes, while the lateral displacement Ly suppresses the transmission peak.
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