Article

Antenna coupled niobium bolometers for 10 μm wavelength radiation detection

Nat. Inst. of Stand. & Technol., Boulder, CO, USA
IEEE Transactions on Appiled Superconductivity (impact factor: 1.04). 07/2005; DOI:10.1109/TASC.2005.849913 pp.541 - 544
Source: IEEE Xplore

ABSTRACT We report on the fabrication and testing of antenna-coupled niobium bolometers for 10 μm wavelength radiation detection. We use 20 nm thick Nb films on oxidized Si substrates. The bolometer design consists of a 1 μm×1 μm Nb microbridge embedded in either a dipole or a spiral Au antenna. We have performed dark dc tests on devices in vacuum at 4.2 K. Current biased dark measurements correspond well to established theory. This result allows us to extract an upper limit for the value of thermal conductance g (340 nWK-1)-hence an indirect measure of the device bandwidth (0.2 GHz). Measurements under incident black body radiation show that the radiation perturbs the return switching characteristics of the devices.

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Keywords

1 μm×1 μm Nb microbridge
 
10 μm wavelength radiation detection
 
antenna-coupled niobium bolometers
 
dark dc tests
 
dark measurements correspond
 
device bandwidth
 
devices
 
indirect measure
 
K. Current
 
Measurements
 
oxidized Si substrates
 
radiation perturbs
 
spiral Au antenna
 
thermal conductance g