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

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.
Authors:
; ; ;  [1] ; ; ; ;  [2]
  1. Purple Mountain Observatory, CAS, 2 West Beijing Road, Nanjing 210008 (China)
  2. Observeratoire de Paris, 61 avenue de l'Observatoire, Paris 75014 (France)
Publication Date:
OSTI Identifier:
22283229
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; BOLOMETERS; ELECTRONS; FREQUENCY DEPENDENCE; NIOBIUM; NIOBIUM NITRIDES; SUPERCONDUCTING FILMS; SUPERCONDUCTORS; SURFACES; THIN FILMS