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Opt Express. 2007 Sep 3;15(18):11117-25.

Terahertz wave polarization rotation with double layered metal grating of complimentary chiral patterns.

Abstract

We propose and demonstrate polarization rotation of a terahertz (THz) electromagnetic wave by using two-dimensional gratings consisting of two displaced layers of gold film with complimentary chiral patterns with four-fold symmetry. We develop a time domain THz polarimetry method with three wire grid polarizers and distinguish optical activity from optical anisotropy. We obtain the isotropic polarization rotation of a terahertz wave free from the birefringence of the structures. Results indicate the possibility of controlling THz polarization with artificial chiral structures fabricated with thin metal films.

PMID:
19547466
[PubMed]
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