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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/094/0002

    • Keywords

       

      Terahertz; metamaterial; polarisers

    • 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 50 $\mu$m size on 1 mm GaAs substrate with a gold cut wire of 65 $\mu$m length, 2 $\mu$m 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.

    • Author Affiliations

       

      BAGVANTH REDDY SANGALA1 2 ARVIND NAGARAJAN1 PRATHMESH DESHMUKH1 HARSHAD SURDI1 GOUTAM RANA3 VENU GOPAL ACHANTA1 S S PRABHU1

      1. Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India
      2. Department of Physics, P.G. Centre at Wanaparthy, Palamuru University, Mahbubnagar 509 001, India
      3. Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India

    • Dates

       
      Published
      1 January 2020
      Manuscript received
      26 April 2019
      Manuscript revised
      29 August 2019
      Accepted
      11 September 2019
      Early published
      Unedited version published online
      Final version published online
      18 December 2019

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