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18 November 2019 Development of multi-beam Fourier phase grating at 660 GHz
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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.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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