Abstract
Cross-shaped-hole arrays (CSHAs) are selected for diminishing the polarization-dependent transmission differences of incident plane waves. We investigate the light transmission spectrum of the CSHAs in a thin gold film over a wide range of features. It is observed that two well-separated and high transmission efficiency peaks could be obtained by designing the parameters in the CSHAs for both p-polarized and s-polarized waves; and a nice transmission band-pass is also observed by specific parameters of a CSHA too. It implicates the possibility to obtain a desired polarization-independent transmission spectrum from the CSHAs by designing their parameters. These findings provide potential applications of the metallic nano-structures in optical filters, optical band-pass, optical imaging, optical sensing, and biosensors.
Highlights
The extraordinary light transmission (ELT) of sub-wavelength-hole arrays in thin metal films are of interest to many researchers, due to their many applications in optical imaging, optical communication, and optical sensing
The fraction of light transmitted through a periodic array of sub-wavelength-hole in a metallic film exceeds the open fraction occupied by the holes at certain wavelengths are related to the periodicity of the hole array [1], and the transmission can be anomalously large as compared to well-established predictions for isolated holes [2]
Surface plasmons (SPs) are electromagnetic waves propagate along the surface of a metal; they are trapped on the surface due to the interaction between the light wave and the free electrons of the metal; the free electrons respond collectively by oscillating in resonance with the light wave
Summary
The extraordinary light transmission (ELT) of sub-wavelength-hole arrays in thin metal films are of interest to many researchers, due to their many applications in optical imaging, optical communication, and optical sensing.
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