Open AccessElectrical and optical properties of a bolometer with a suspended absorber and tunneling-current thermometers
Author(s) -
M. A. Tarasov,
V. S. Édelman,
S. Mahashabde,
M. Yu. Fominsky,
S. A. Lemzyakov,
A. M. Chekushkin,
R. A. Yusupov,
D. Winkler,
A. Yurgens
Publication year - 2017
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4986463
Subject(s) - responsivity , bolometer , joule heating , quantum tunnelling , optoelectronics , electron , biasing , physics , thermalisation , quantum efficiency , condensed matter physics , materials science , voltage , optics , atomic physics , photodetector , quantum mechanics , detector
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 109 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 300 GHz and 100 mK, the bolometer demonstrates the voltage and current response of 3 × 108 V/W and 1.1 × 104 A/W, respectively, corresponding to the quantum efficiency of ∼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
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