PT Journal
AU Miao, W
   Zhang, W
   Zhong, JQ
   Shi, SC
   Delorme, Y
   Lefevre, R
   Feret, A
   Vacelet, T
TI Non-uniform absorption of terahertz radiation on superconducting hot electron bolometer microbridges
SO Appl. Phys. Lett.
JI <ef><bf><bc>Appl. Phys. Lett.
PY 2014
BP 052605(1
EP 4)
VL 104
DI 10.1063/1.4864763
DE NbN HEB mixers; local oscillator power; RF nonuniform absorption
AB 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.
ER