Towards ultra-broadband heterodyne interferometry in the N- and Q-bands

Ernest A. Michael; Ramin Emadi; Enrique Moreno; Lucas Labadie; Cornelia E. Honingh; Karl Jacobs; Urs U. Graf; Stephan Schlemmer; Jürgen Stutzki

doi:10.1117/12.2563069

14 December 2020 Towards ultra-broadband heterodyne interferometry in the N- and Q-bands

Ernest A. Michael, Ramin Emadi, Enrique Moreno, Lucas Labadie, Cornelia E. Honingh, Karl Jacobs, Urs U. Graf, Stephan Schlemmer, Jürgen Stutzki

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Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114462O (2020) https://doi.org/10.1117/12.2563069
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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Abstract

For the telescope number and size of the PFI proposal (20 x 8m), the Q-band (around 25 μm) was shown to be an optimal complement to submm- and optical interferometry, to detect substructures in proto-planetary disks. Here, broadband medium-resolution heterodyne would be an appropriate option, considering recent experimental findings on a quantum-limit heterodyne detection (HD) scheme. Under high thermal background and the very small beam filling factors in interferometry, HD was shown to be more sensitive than direct detection for the same bandwidth for wavelengths larger 3-8 micron, depending on the conditions. A new class of heterodyne mixers based on graphene could extend the instantaneous IF-bandwidth up to hundred GHz, for which photonic correlators may be developed since a resolution of R=30000 would be sufficient at 10μm. Such large IF-bandwidths could then even be multiplied in “dispersed heterodyne receivers” using optical frequency combs and photonic techniques derived from the DWDM technology.

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Ernest A. Michael, Ramin Emadi, Enrique Moreno, Lucas Labadie, Cornelia E. Honingh, Karl Jacobs, Urs U. Graf, Stephan Schlemmer, and Jürgen Stutzki "Towards ultra-broadband heterodyne interferometry in the N- and Q-bands", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114462O (14 December 2020); https://doi.org/10.1117/12.2563069

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