Journal
OPTICS EXPRESS
Volume 15, Issue 18, Pages 11117-11125Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.011117
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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. (c) 2007 Optical Society of America.
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