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Indexed by:期刊论文

Date of Publication:2012-01-01

Journal:JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS

Included Journals:SCIE、Scopus

Volume:26

Issue:10

Page Number:1275-1282

ISSN No.:0920-5071

Abstract:We investigate the polarization properties of a two-dimensional (2D) array of metallic elliptical nanoholes in the visible wavelength region. The calculated spectra reveal that such a nonchiral structure exhibits a circular dichroism. The proposed structure is a 2D anisotropic system that possesses two principle polarization directions, which gives rise to different polarization modes along long and short diameters of an elliptical nanohole. When the nonchiral elliptical hole forms a chiral arrangement with the off-normal incident wave vector, the two different polarization modes introduce a net polar vector that forms a chiral triad. Therefore, circular dichroism can be observed in a nonchiral elliptical nanohole array.