Journal article

Terahertz transmissive half-wave metasurface with enhanced bandwidth

Xiaolong You, Rajour T Ako, Wendy SL Lee, Madhu Bhaskaran, Sharath Sriram, Christophe Fumeaux, Withawat Withayachumnankul

OPTICS LETTERS | OPTICAL SOC AMER | Published : 2021

Abstract

Polarization conversion is useful for studies of chiral structures in biology and chemistry, and for polarization diversity in communications. It is conventionally realized with wave plates, which, however, present challenges due to limited material availability, as well as narrow bandwidth and low efficiency at terahertz frequencies. To enhance bandwidth and efficiency, the concept of the Huygens' metasurface is adopted here for a transmissive half-wave plate. The half-wave metasurface is designed following the optimal frequency-independent circuit parameters provided by a broadband semi-analytical approach. Simulation results of an optimal design suggest that a 15-dB extinction ratio can b..

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Grants

Awarded by Australian Research Council


Awarded by China Scholarship Council


Funding Acknowledgements

Australian Research Council (DP170101922); China Scholarship Council (201606270204).