Open AccessTerahertz wave polarization rotation with double layered metal grating of complimentary chiral patterns
Author(s) -
Natsuki Kanda,
Kuniaki Konishi,
Makoto KuwataGonokami
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.011117
Subject(s) - terahertz radiation , polarizer , optics , birefringence , materials science , polarization (electrochemistry) , optical rotation , grating , polarimetry , isotropy , optoelectronics , circular polarization , terahertz spectroscopy and technology , faraday effect , polarization rotator , physics , scattering , magnetic field , chemistry , quantum mechanics , microstrip
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.