title: Efficiency of multi-beam Fourier phase gratings at 1.4 THz.
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 × 2 and 2 × 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.
authors.forename: B
authors.initials: B
authors.lastname: Mirzaei
authors.forename: J R G
authors.initials: JR
authors.lastname: Silva
authors.forename: Y C
authors.initials: YC
authors.lastname: Luo
authors.forename: X X
authors.initials: XX
authors.lastname: Liu
authors.forename: L
authors.initials: L
authors.lastname: Wei
authors.forename: D J
authors.initials: DJ
authors.lastname: Hayton
authors.forename: J R
authors.initials: JR
authors.lastname: Gao
authors.forename: C
authors.initials: C
authors.lastname: Groppi