Open AccessMetal-film subwavelength-grating polarizer with low insertion losses and high extinction ratios in the terahertz region
Author(s) -
Shuichi Kodaira,
Kengo Muraki
Publication year - 2015
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.23.016676
Subject(s) - polarizer , extinction ratio , materials science , terahertz radiation , optics , grating , optoelectronics , fabrication , wavelength , birefringence , physics , medicine , alternative medicine , pathology
A metal-film subwavelength-grating polarizer with high performance in the terahertz region is presented. The polarizer was obtained by depositing a thin Au film on a resin grating with a triangular cross section duplicated from a metal mold by using the imprinting method. Microstructural parameters were investigated in detail. Measured insertion losses were less than 0.5 dB in the frequency range of 0.5-3 THz, while extinction ratios were 50 dB in the range of 0.5-2.3 THz. The proposed fabrication method is suited to mass production of large-aperture robust polarizers.