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.G. Silva (SRON–Netherlands Institute for Space Research)
Y. Luo (Student TU Delft, Kavli institute of nanoscience Delft)
X. X. Liu
L. Wei (TU Delft - ImPhys/Optics)
Darren 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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