Efficiency of multi-beam Fourier phase gratings at 1.4 THz

We compare the results of simulated and measured power efficiency and far-field beam pattern, for two reflective Fourier phase gratings, designed to generate 2 × 2 and 2 × 4 beams respectively from a single-beam, coherent source at 1.4 THz. The designed surface structures were manufactured on alumin...

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Bibliographic Details
Published in:Optics express 2017-03, Vol.25 (6), p.6581-6588
Main Authors: Mirzaei, B, Silva, J R G, Luo, Y C, Liu, X X, Wei, L, Hayton, D J, Gao, J R, Groppi, C
Format: Article
Language:English
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Summary:We compare the results of simulated and measured power efficiency and far-field beam pattern, for two reflective Fourier phase gratings, designed to generate 2 × 2 and 2 × 4 beams respectively from a single-beam, coherent source at 1.4 THz. The designed surface structures were manufactured on aluminum plates by a computer numerical control (CNC) micro-milling machine. Despite small differences between the designed and fabricated gratings, we measured power efficiencies of both gratings to be around 70%, which is in a good agreement with the simulated values. We also find a good agreement between the simulated and measured diffracted beam size and spatial distribution. We demonstrate the application of both gratings as multiple beam local oscillators to simultaneously pump (or operate) a 4-pixel array of superconducting heterodyne mixers.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.006581