Non-uniform absorption of terahertz radiation on superconducting hot electron bolometer microbridges

Journal Article · Mon Feb 03 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4864763· OSTI ID:22283229

Miao, W.; Zhang, W.; Zhong, J. Q.; Delorme, Y.; Lefevre, R.; Feret, A.; Vacelet, T. ^[1]

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1. Observeratoire de Paris, 61 avenue de l'Observatoire, Paris 75014 (France)

We interpret the experimental observation of a frequency-dependence of superconducting hot electron bolometer (HEB) mixers by taking into account the non-uniform absorption of the terahertz radiation on the superconducting HEB microbridge. The radiation absorption is assumed to be proportional to the local surface resistance of the HEB microbridge, which is computed using the Mattis-Bardeen theory. With this assumption the dc and mixing characteristics of a superconducting niobium-nitride (NbN) HEB device have been modeled at frequencies below and above the equilibrium gap frequency of the NbN film.

• OSTI ID: 22283229
• Journal Information: Applied Physics Letters, Vol. 104, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
BOLOMETERS
ELECTRONS
FREQUENCY DEPENDENCE
NIOBIUM
NIOBIUM NITRIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
SURFACES
THIN FILMS