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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhe Huang
  • Edward P. J. Parrott
  • Hongkyu Park
  • Hau Ping Chan
  • Emma Pickwell-MacPherson

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)793-796
Journal / PublicationOptics Letters
Volume39
Issue number4
Online published5 Feb 2014
Publication statusPublished - 15 Feb 2014

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.

Citation Format(s)

High extinction ratio and low transmission loss thin-film terahertz polarizer with a tunable bilayer metal wire-grid structure. / Huang, Zhe; Parrott, Edward P. J.; Park, Hongkyu et al.
In: Optics Letters, Vol. 39, No. 4, 15.02.2014, p. 793-796.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review