Cryogenic bolometer with suspended absorber
M.Tarasov1,2,4, V.Edelman2,
M.Fominsky1, R.Yusupov1,3, A.Yurgens4
1 Kotelnikov Institute of Radio Engineering
and Electronics RAS
2
Kapitza Institute for Physical Problems RAS
3
Moscow Institute of Physics and Technology (State University)
4
Chalmers University of Technology
The paper is received on January 18, 2016
Abstract.
A robust and simple
technology for making suspended normal-metal (N) thin film bridges between
superconducting (S) aluminum electrodes with tunnel barriers (I) was
developed. The bridges represent effective bolometer absorbers with reduced
heat losses to substrates. Such SINIS bolometers integrated with planar
antennas are intended for operation in the THz-range of radiation. Samples
with different absorber materials were fabricated and current-voltage
characteristics were measured at mK temperatures. Samples with Cu absorber
demonstrate a high sub-gap resistance that makes them competitive to
conventional detectors. Potentially, such bolometers can improve the optical
responsivity by an order of magnitude, up to 109 V/W, as estimated
from the equivalent dc power response in earlier prototypes.
Keywords:
SIN junction, bolometer, manufacturing suspended structures.