Metallic nano-structures for polarization-independent multi-spectral filters
1 The Department of Physics, North Carolina Central University, Durham, NC, 27707, USA
2 Department of Electrical and Computer Engineering, Duke University, Durham, NC, 27708, USA
Nanoscale Research Letters 2011, 6:394 doi:10.1186/1556-276X-6-394Published: 23 May 2011
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.