Terahertz Beam Splitting Lens for Efficient LO Coupling to a 7-pixel 1.9 THz Heterodyne Array
Date
2024
Authors
Li, M.S.
Van Berkel, S.
Stake, J.
Chattopadhyay, G.
Withayachumnankul, W.
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Conference paper
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International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz, 2024, pp.1-2
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Mingxiang Stephen Li, Sven van Berkel, Jan Stake, Goutam Chattopadhyay, and Withawat Withayachumnankul
Conference Name
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz (1 Sep 2024 - 6 Sep 2024 : Perth, Western Australia)
Abstract
Terahertz heterodyne arrays are promising spectroscopic instruments for submillimeter-wave astronomy applications. High-frequency multi-pixel heterodyning detection necessitates a local oscillator (LO) signal distributed and fed via free space by using a silicon lens array. However, limitations exist in the coupling of LO power emitted from a horn antenna. In this paper, we propose a free-form silicon lens for converting the input LO signal with a quasi-Gaussian profile into 7 beams with equal power for efficient coupling with the heterodyne array at 1.95 THz. The phase profile of this lens is calculated using a modified Gerchberg-Saxton (GS) algorithm. Analytical and full-wave simulations suggest that field coupling can be significantly improved, potentially reaching around 90%.
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©2024 IEEE