Bandwidth of a 4.7 THz asymmetric Fourier grating

Conference paper (2019)

Authors

Y. Gan Rijksuniversiteit Groningen, SRON–Netherlands Institute for Space Research
B. Mirzaei QN/Gao Lab , SRON–Netherlands Institute for Space Research, ImPhys/Optics - AS
J. R.G. Silva SRON–Netherlands Institute for Space Research, Rijksuniversiteit Groningen
Wouter Laauwen SRON–Netherlands Institute for Space Research
F.F.S. van der Tak SRON–Netherlands Institute for Space Research, Rijksuniversiteit Groningen
J.R. Gao SRON–Netherlands Institute for Space Research, ImPhys/Optics - AS
Research Group
ImPhys/Optics (AS) (TU Delft)
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Optics

Abstract

We present an analysis of the bandwidth of a preliminary designed asymmetric 8-pixel Fourier grating as the beam multiplexer for the 4.7 THz local oscillator of the GUSTO mission. We take the GUSTO grating as an example to address the bandwidth question although GUSTO itself does not need to operate over a wide frequency range. By illuminating single beams with different frequencies from 4.445 THz to 5.045 THz to the grating, we simulated the changes in the grating’s performance in three aspects using COMSOL Multiphysics: diffraction efficiency, power distribution, and the angular distribution of the output beams. These parameters can reduce the coupling efficiency between the output beams of the grating and the beams of the mixer array of GUSTO. The grating’s bandwidth is calculated to be 250 GHz, which is sufficient for many applications.