A Polarizer Using Thin Metallic-Film Subwavelength Grating for Infrared to Terahertz Region

Author

Shiraishi, Kazuo ; Oyama, Satoshi ; Tsai, Chen S.

Author_Institution

Grad. Sch. of Eng., Utsunomiya Univ., Utsunomiya, Japan

Volume

29

Issue

5

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

670

Lastpage

676

Abstract

A polarizer using a sinusoidal or triangular thin metallic-film subwavelength grating is proposed. The dependence of polarizer transmission characteristics on structural parameters of the grating was obtained numerically, and its potential for high performance was confirmed experimentally. The measured transmission loss for the TE-waves with a 25 nm-thick gold-film grating with a triangular profile was higher than 50 dB while the corresponding transmission loss for the TM-waves was lower than 1 dB in the frequency range of 1.0-2.5 THz. The metallic subwavelength grating structure has demonstrated its potential as a low-loss, high-extinction ratio, wide-aperture, and robust polarizer for the infrared and terahertz regions.

Keywords

diffraction gratings; optical films; optical polarisers; TE-waves; frequency 1 THz to 2.5 THz; gold-film grating; infrared regions; metallic subwavelength grating structure; polarizer transmission; size 25 nm; terahertz regions; thin metallic-film subwavelength grating; Gratings; optical components; optical polarization; thin films;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2010.2103303

Filename

5678613