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 \(50~{\mu }\hbox {m}\) size on 1 mm GaAs substrate with a gold cut wire of \(65~{\mu }\hbox {m}\) length, \(2~{\mu }\hbox {m}\) 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.
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Sangala, B.R., Nagarajan, A., Deshmukh, P. et al. Single and multiband THz metamaterial polarisers. Pramana - J Phys 94, 2 (2020). https://doi.org/10.1007/s12043-019-1876-2
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DOI: https://doi.org/10.1007/s12043-019-1876-2