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Terahertz; metamaterial; polarisers

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.

BAGVANTH REDDY SANGALA^{1 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

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