Efficiency of multi-beam Fourier phase gratings at 1.4 THz

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

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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 languageEnglish (US)
Pages (from-to)6581-6588
Number of pages8
JournalOptics Express
Volume25
Issue number6
DOIs
Publication statusPublished - Mar 20 2017

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Mirzaei, B., Silva, J. R. G., Luo, Y. C., Liu, X. X., Wei, L., Hayton, D. J., ... Groppi, C. (2017). Efficiency of multi-beam Fourier phase gratings at 1.4 THz. Optics Express, 25(6), 6581-6588. https://doi.org/10.1364/OE.25.006581