title: Metallic nano-structures for polarization-independent multi-spectral filters.
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.
authors.affiliation: The Department of Physics, North Carolina Central University, Durham, NC, 27707, USA. tangy@nccu.edu.
authors.forename: Yongan
authors.initials: Y
authors.lastname: Tang
authors.forename: Branislav
authors.initials: B
authors.lastname: Vlahovic
authors.forename: David Jones
authors.initials: DJ
authors.lastname: Brady