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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 34, Iss. 3 — Feb. 1, 2009
  • pp: 274–276

Terahertz wire-grid polarizers with micrometer-pitch Al gratings

Itsunari Yamada, Keisuke Takano, Masanori Hangyo, Mitsunori Saito, and Wataru Watanabe  »View Author Affiliations


Optics Letters, Vol. 34, Issue 3, pp. 274-276 (2009)
http://dx.doi.org/10.1364/OL.34.000274


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Abstract

We fabricated a terahertz wire-grid polarizer consisting of a micrometer-pitch Al grating on a Si substrate by photolithography and wet etching. The ratio of TM and TE transmittances (extinction ratio) was over 35 dB at 0.5 THz . At the Brewster angle of the Si substrate, the polarization transmittance of a TM wave through the fabricated polarizer exceeded 95% and the extinction ratio was over 45 dB at 1 THz . The fabricated polarizer has a higher extinction ratio than conventional free-standing terahertz wire-grid polarizers.

© 2009 Optical Society of America

OCIS Codes
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.5440) Optical devices : Polarization-selective devices
(260.3090) Physical optics : Infrared, far
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: October 24, 2008
Manuscript Accepted: November 30, 2008
Published: January 26, 2009

Citation
Itsunari Yamada, Keisuke Takano, Masanori Hangyo, Mitsunori Saito, and Wataru Watanabe, "Terahertz wire-grid polarizers with micrometer-pitch Al gratings," Opt. Lett. 34, 274-276 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-3-274


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