Efficiency of multi-beam Fourier phase gratings at 1.4 THz

B. Mirzaei; J. R.G. Silva; Y. Luo; X. X. Liu; L. Wei; Darren J. Hayton; J. R. Gao; C Groppi

doi:10.1364/OE.25.006581

Efficiency of multi-beam Fourier phase gratings at 1.4 THz

B. Mirzaei, J. R.G. Silva, Y. Luo, X. X. Liu, L. Wei, Darren J. Hayton, J. R. Gao, C Groppi

ImPhys/Optics

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Abstract

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 x 2 and 2 x 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.

Original language	English
Pages (from-to)	6581-6588
Number of pages	8
Journal	Optics Express
Volume	25
Issue number	6
DOIs	https://doi.org/10.1364/OE.25.006581
Publication status	Published - 20 Mar 2017

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AU - Silva, J. R.G.

AU - Luo, Y.

AU - Liu, X. X.

AU - Wei, L.

AU - Hayton, Darren J.

AU - Gao, J. R.

AU - Groppi, C

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Efficiency of multi-beam Fourier phase gratings at 1.4 THz

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