Single and multiband THz metamaterial polarisers

Bagvanth Reddy Sangala (Corresponding author), Arvind Nagarajan, Prathmesh Deshmukh, Harshad Surdi, Goutam Rana, Venu Gopal Achanta, S.S. Prabhu

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We report single and multiband linear polarisers for terahertz (THz) frequencies using cut-wire metamaterials (MM). The MMs were designed by finite-element method (FEM), fabricated by electron beam lithography, and characterised by THz time-domain spectroscopy. The MM unit cells consist of single or multiple length cut-wire pads of gold on semi-insulating gallium arsenide (GaAs) for single or multiple band polarisers. For example, a MM with a square unit cell of 50μm size on 1 mm GaAs substrate with a gold cut wire of 65μm length, 2μm width, and 150 nm height gives a resonance around 1.05 THz. The dependence of the resonance frequency of the single-band polariser on the length of the cut-wires was explained based on transmission line model.

Original languageEnglish
Article number2
Number of pages6
JournalPramana
Volume94
Issue number1
DOIs
Publication statusPublished - 18 Dec 2019

Keywords

  • 07.57.−c
  • 42.25.Ja
  • 78.67.Pt
  • Terahertz
  • metamaterial
  • polarisers

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