Title :
Circular dichroism in planar achiral metamaterial
Author :
Libang Mao;Tun Cao
Author_Institution :
Department of Biomedical Engineering, Faculty of Electronic information and Electrical Engineering Dalian University of Technology, China(P.R.C)
fDate :
7/1/2015 12:00:00 AM
Abstract :
We investigate the polarization properties of a two-dimensional 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.
Keywords :
"Polarization","Metamaterials","Nanobioscience","Optical polarization","Surface waves","Arrays","Optical refraction"
Conference_Titel :
Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), 2015 IEEE MTT-S International Microwave Workshop Series on
DOI :
10.1109/IMWS-AMP.2015.7324932