Bandwidth of a 4.7 THz beam multiplexer based on Fourier grating

Y. Gan*, B. Mirzaei, J. R.G. Silva, W. Laauwen, F. F.S. Van Der Tak, J. R. Gao

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We present an analysis of the bandwidth of an asymmetric 8-beam Fourier grating as the beam multiplexer for a 4.7 THz local oscillator used in a heterodyne receiver. We take the grating designed for NASA GUSTO balloon observatory as an example to address the bandwidth question although it does not need to operate over a wide frequency range. By illuminating the grating at different frequencies from 4.445 to 5.045 THz, we simulated the changes of its performance in three aspects using COMSOL Multiphysics: diffraction efficiency, power uniformity, and the angular distribution of the output beams. These parameters can affect the coupling efficiency between the output beams of the grating and the beams of a mixer array. The bandwidth of the grating is found to be 230 GHz, corresponding to 4.9% of the operating frequency, which is sufficient for many applications.

Original languageEnglish
Article number064006
Number of pages8
JournalJournal of Optics (United Kingdom)
Volume24
Issue number6
DOIs
Publication statusPublished - 2022

Keywords

  • Bandwidths
  • Fourier grating
  • Heterodyne detection
  • Quantum cascade laser
  • Terahertz

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