Journal article

Broadband terahertz transmissive quarter-wave metasurface

X You, RT Ako, WSL Lee, M Bhaskaran, S Sriram, C Fumeaux, W Withayachumnankul

APL Photonics | Published : 2020

Abstract

Polarization conversion devices are key components in spectroscopy and wireless communications systems. Conventional terahertz waveplates made of natural birefringent materials typically suffer from low efficiency, narrow bandwidth, and substantial thickness. To overcome the limitations associated with conventional waveplates, a terahertz quarter-wave metasurface with enhanced efficiency and wide bandwidth is proposed. The transmissive quarter-wave metasurface is rigorously designed based on an extended semi-analytical approach employing network analysis and genetic algorithm. Simulation results suggest that the design can achieve linear-to-circular polarization conversion with a 3-dB axial ..

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