Efficiency of multi-beam Fourier phase gratings at 1.4 THz
B Mirzaei (TU Delft - QN/Gao Lab, Kavli institute of nanoscience Delft)
J. R. Silva (SRON–Netherlands Institute for Space Research)
Y. Luo (Student TU Delft, Kavli institute of nanoscience Delft)
L Wei (TU Delft - ImPhys/Optics)
D. J. Hayton (SRON–Netherlands Institute for Space Research)
J.R. Gao (SRON–Netherlands Institute for Space Research, Kavli institute of nanoscience Delft, TU Delft - QN/Gao Lab)
C. Groppi (Arizona State University)
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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.
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