Single and multiband THz metamaterial polarisers
BAGVANTH REDDY SANGALA ARVIND NAGARAJAN PRATHMESH DESHMUKH HARSHAD SURDI GOUTAM RANA VENU GOPAL ACHANTA S S PRABHU
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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 SANGALA1 2 ARVIND NAGARAJAN1 PRATHMESH DESHMUKH1 HARSHAD SURDI1 GOUTAM RANA3 VENU GOPAL ACHANTA1 S S PRABHU1
Volume 97, 2023
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