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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 4 — Feb. 15, 2014
  • pp: 793–796

High extinction ratio and low transmission loss thin-film terahertz polarizer with a tunable bilayer metal wire-grid structure

Zhe Huang, Edward P. J. Parrott, Hongkyu Park, Hau Ping Chan, and Emma Pickwell-MacPherson  »View Author Affiliations


Optics Letters, Vol. 39, Issue 4, pp. 793-796 (2014)
http://dx.doi.org/10.1364/OL.39.000793


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Abstract

A thin-film terahertz polarizer is proposed and realized via a tunable bilayer metal wire-grid structure to achieve high extinction ratios and good transmission. The polarizer is fabricated on top of a thin silica layer by standard micro-fabrication techniques to eliminate the multireflection effects. The tunable alignment of the bilayer aluminum-wire grid structure enables tailoring of the extinction ratio and transmission characteristics. Using terahertz time-domain spectroscopy (THz-TDS), a fabricated polarizer is characterized, with extinction ratios greater than 50 dB and transmission losses below 1 dB reported in the 0.2–1.1 THz frequency range. These characteristics can be improved by further tuning the polarizer parameters such as the pitch, metal film thickness, and lateral displacement.

© 2014 Optical Society of America

OCIS Codes
(310.4165) Thin films : Multilayer design
(300.6495) Spectroscopy : Spectroscopy, teraherz
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Thin Films

History
Original Manuscript: November 13, 2013
Revised Manuscript: December 21, 2013
Manuscript Accepted: December 29, 2013
Published: February 5, 2014

Citation
Zhe Huang, Edward P. J. Parrott, Hongkyu Park, Hau Ping Chan, and Emma Pickwell-MacPherson, "High extinction ratio and low transmission loss thin-film terahertz polarizer with a tunable bilayer metal wire-grid structure," Opt. Lett. 39, 793-796 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-4-793

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