Terahertz Beam Splitting Lens for Efficient LO Coupling to a 7-pixel 1.9 THz Heterodyne Array
Paper in proceeding, 2024
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%.
Author
Mingxiang Stephen Li
University of Adelaide
Sven Van Berkel
California Institute of Technology (Caltech)
Jan Stake
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Goutam Chattopadhyay
California Institute of Technology (Caltech)
Withawat Withayachumnankul
University of Adelaide
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
21622027 (ISSN) 21622035 (eISSN)
9798350370324 (ISBN)
49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024
Perth, Australia,
Perth, Australia,
Development of the national infrastructure for microwave and terahertz characterization: expanding the use of the electromagnetic spectrum
Swedish Research Council (VR) (2020-06187), 2021-01-01 -- 2024-12-31.
Subject Categories (SSIF 2011)
Aerospace Engineering
Signal Processing
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/IRMMW-THz60956.2024.10697622