Development of multi-beam Fourier phase grating at 660 GHz

Daixi Zhang; Yuan Ren; Dong Liu; Kangmin Zhou; Wei Miao; Wen Zhang; Shengcai Shi

doi:10.1117/12.2536737

18 November 2019 Development of multi-beam Fourier phase grating at 660 GHz

Daixi Zhang, Yuan Ren, Dong Liu, Kangmin Zhou, Wei Miao, Wen Zhang, Shengcai Shi

Proceedings Volume 11196, Infrared, Millimeter-Wave, and Terahertz Technologies VI; 1119605 (2019) https://doi.org/10.1117/12.2536737
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

Fourier phase gratings play a vital role in the multi-beam heterodyne receiver in sub-millimeter astronomical instruments. In this study, a 1×4 beam grating at 660 GHz is developed, by which the surface structure is generated with an iterative algorithm. Far-field beam pattern is simulated with FEKO, where a relative high efficiency of 91% as well as a uniformity of power distribution among 4 beams of less than 1% are obtained. The grating was manufactured in aluminum material by a micro-milling machine. A PC-controlled scanning stage is employed for the beam pattern measurement. Despite the discrepancy from the manufacture of less than 6 μm, measurement results exhibit a good agreement with simulation in both power efficiency and far-field spatial distribution.

Citation Download Citation

Daixi Zhang, Yuan Ren, Dong Liu, Kangmin Zhou, Wei Miao, Wen Zhang, and Shengcai Shi "Development of multi-beam Fourier phase grating at 660 GHz", Proc. SPIE 11196, Infrared, Millimeter-Wave, and Terahertz Technologies VI, 1119605 (18 November 2019); https://doi.org/10.1117/12.2536737

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