Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..mar.m8002s&link_type=abstract
American Physical Society, Annual APS March Meeting, March 18 - 22, 2002 Indiana Convention Center; Indianapolis, Indiana Meetin
Physics
Scientific paper
Hot-electron bolometer (HEB) mixers are promising candidates for use in terahertz heterodyne receivers. The input RF signal is amplitude modulated by the addition of a carrier signal. The electron temperature of the superconducting microbridge oscillates only at the envelope frequency ( GHz), and when biased in the vicinity of the superconducting transition, the device resistance modulates at this frequency. Based on microwave measurements, we have shown that the properties of diffusion-cooled HEBs depend on the critical temperature. Lower critical temperature mixers have greater sensitivity (mixer noise temperature scales with Tc) but are more prone to saturation effects. Nb-Au devices use the S-N proximity effect to tune the critical temperature of the microbridge. For a given application, the optimum critical temperature is determined from the scaling data. A HEB mixer with this Tc can then be fabricated by choosing an appropriate thickness of gold to be deposited on top of the niobium. We present the experimental results and microscopic model calculations.
Prober Daniel E.
Siddiqi Irfan
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