Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-01-01

Journal: JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS

Included Journals: Scopus、SCIE

Volume: 26

Issue: 10

Page Number: 1275-1282

ISSN: 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.