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

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

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
StatePublished - Mar 20 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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