Electrical and optical properties of a bolometer with a suspended absorber and tunneling-current thermometers
Journal article, 2017
We have developed a bolometer with a suspended normal-metal absorber connected to superconducting leads via tunneling barriers. Such an absorber has reduced heat losses to the substrate, which greatly increases the responsivity of the bolometer to over 10(9) V/W at 75 mK when measured by dc Joule heating of the absorber. For high-frequency experiments, the bolometers have been integrated in planar twin-slot and log-periodic antennas. At 300GHz and 100 mK, the bolometer demonstrates the voltage and current response of 3 x 10(8) V/W and 1.1 x 10(4) A/W, respectively, corresponding to the quantum efficiency of similar to 15 electrons per photon. An effective thermalization of electrons in the absorber favors the high quantum efficiency. We also report on how the in-plane-and transverse magnetic fields influence the device characteristics.
Conductivity
Superconductor
Junctions
Magnetic-Field
Author
Mikhail Tarasov
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Valerian S. Edelman
Russian Academy of Sciences
Sumedh Mahashabde
University of Oxford
M. Fominsky
National Research University of Electronic Technology (MIET)
S. Lemzyakov
Moscow Institute of Physics and Technology
Russian Academy of Sciences
A. Chekushkin
Moscow Institute of Physics and Technology
National Research University of Electronic Technology (MIET)
R. Yusupov
Moscow Institute of Physics and Technology
National Research University of Electronic Technology (MIET)
Dag Winkler
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Avgust Yurgens
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Applied Physics Letters
0003-6951 (ISSN) 1077-3118 (eISSN)
Vol. 110 24 242601Subject Categories
Condensed Matter Physics
DOI
10.1063/1.4986463