Terahertz Beam Shaping: Gaussian to Flat-top Beam Conversion Through Tri-layer Metasurface
Date
2022
Authors
Li, M.S.
Fumeaux, C.
Withayachumnankul, W.
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Conference paper
Citation
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz, 2022, vol.2022-August, pp.1-2
Statement of Responsibility
Mingxiang Stephen Li, Christophe Fumeaux, and Withawat Withayachumnankul
Conference Name
International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (28 Aug 2022 - 2 Sep 2022 : Delft, The Netherlands)
Abstract
A flat-top beam is preferred to a normal Gaussian beam for various imaging applications since it provides more uniform illumination over a scene. In this paper, we present a highly efficient tri-layer metasurface lens for terahertz beam shaping, namely Gaussian to flat-top beam conversion. This metasurface includes linear polarization conversion, and a full 2π phase tunability range can be covered by varying the geometry of anisotropic resonators. The required phase profile of the metasurface lens is obtained through the Gerchberg–Saxton (GS) algorithm. Full-wave simulations and analytical results confirm that the incident Gaussian beam is transformed to a flat-top beam.
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©2022 IEEE