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Room Temperature, Quantum-Limited THz Heterodyne Detection? Not Yet

Zmuidzinas, J. and Karasik, B. and Kerr, A. R. and Pospieszalski, M. (2019) Room Temperature, Quantum-Limited THz Heterodyne Detection? Not Yet. . (Unpublished)

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In their article, Wang et al. [1] report a new scheme for THz heterodyne detection using a laser-driven LTG-GaAs photomixer [2, 3] and make the impressive claim of achieving near quantum-limited sensitivity at room temperature. Unfortunately, their experimental methodology is incorrect, and furthermore the paper provides no information on the mixer conversion loss, an important quantity that could readily have been measured and reported as a consistency check. The paper thus offers no reliable experimental evidence that substantiates the claimed sensitivities. To the contrary, the very high value reported for their photomixer impedance strongly suggests that the conversion loss is quite poor and that the actual sensitivity is far worse than claimed.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper Wang et al., Nature Astronomy (2019)
Additional Information:The research by BK was performed at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Group:Astronomy Department
Funding AgencyGrant Number
Record Number:CaltechAUTHORS:20191125-133109224
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100035
Deposited By: Tony Diaz
Deposited On:25 Nov 2019 23:56
Last Modified:16 Nov 2021 17:51

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