Zmuidzinas, J. and Karasik, B. and Kerr, A. R. and Pospieszalski, M. (2019) Room Temperature, Quantum-Limited THz Heterodyne Detection? Not Yet. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20191125-133109224
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Abstract
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) | |||||||||
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| 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 | |||||||||
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| DOI: | 10.1038/s41550-019-0828-6 | |||||||||
| Record Number: | CaltechAUTHORS:20191125-133109224 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20191125-133109224 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 100035 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 25 Nov 2019 23:56 | |||||||||
| Last Modified: | 16 Nov 2021 17:51 |
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