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Noise temperature and beam pattern of an NbN hot electron bolometer mixer at 5.25 THz

Zhang, W. and Khosropanah, P. and Gao, J. R. and Bansal, T. and Klapwijk, T. M. and Miao, W. and Shi, S. C. (2010) Noise temperature and beam pattern of an NbN hot electron bolometer mixer at 5.25 THz. Journal of Applied Physics, 108 (9). Art. No. 093102. ISSN 0021-8979. doi:10.1063/1.3503279.

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We report the measured sensitivities of a superconducting NbN hot electron bolometer (HEB) heterodyne receiver at 5.25 THz. Terahertz (THz) radiation is quasioptically coupled to a HEB mixer with a lens and a spiral antenna. Using a measurement setup with black body calibration sources and a beam splitter in vacuo, and an antireflection coated Si lens, we obtained a double sideband (DSB) receiver noise temperature (T^(DSB)_(rec)) of 1150 K, which is nine times hν/2k, where h is the Planck constant, ν the frequency, and k the Boltzmann constant. In addition, the measured far field beam patterns of the integrated lens antenna show nearly collimated beams from 2.5 to 5.3 THz that allow reliable measurement of (T^(DSB)_(rec)) using the vacuum setup. Our experimental results in combination with an antenna-to-bolometer coupling simulation suggest that the HEB mixer can work well at least up to 6 THz, making it suitable for next generation of high-resolution spectroscopic space telescopes and, in particular, for the detection of the neutral atomic oxygen line at 4.7 THz.

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Additional Information:© 2010 American Institute of Physics. Received 14 April 2010; accepted 16 September 2010; published online 1 November 2010. We acknowledge E. L. Kollberg and K. S. Yngvesson for very useful discussions, L. de Jong, W. M. Laauwen, and J. N. Hovenier for their technical support, and W. Horinga for the FTS transmission measurement. The work was supported by the NSFC under Grant Nos. 10803021 and 10621303, by China Exchange Programme executed by KNAW and CAS, and by the AMSTAR+project of RadioNet under FP7 and NWO.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
National Natural Science Foundation of China10803021
National Natural Science Foundation of China10621303
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Koninklijke Nederlandse Akademie van Wetenschappen (KNAW)UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
European Research Council (ERC)UNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20160311-132251440
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65304
Deposited By: Colette Connor
Deposited On:11 Mar 2016 23:02
Last Modified:10 Nov 2021 23:43

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