DocumentCode :
13156
Title :
Author :
Bevilacqua, Stella ; Novoselov, Evgenii ; Cherednichenko, Sergey ; Shibata, Hiroyuki ; Tokura, Yasuhiro
Author_Institution :
Dept. of Microtechnol. & Nanosci. (MC2), Chalmers Univ. of Technol., Goteborg, Sweden
Volume :
25
Issue :
3
fYear :
2015
fDate :
Jun-15
Firstpage :
1
Lastpage :
4
Abstract :
In this paper, we compare the performance of MgB2 Hot-Electron Bolometer Mixers operating at Local Oscillator frequencies of 0.6 and 1.63 THz. The minimum noise temperatures that were obtained are 700 and 1150 K for 0.6 and 1.63 THz, respectively. The receiver noise bandwidth is of the order of 2.2-3 GHz for 10-nm-thick HEB devices with a Tc of 8.5 K. Sub-micrometer size HEBs were also fabricated with no degradation of the initial film quality when a 20-nm MgB2 film with a Tc of 22 K was used. In the direct detection mode, the maximum voltage responsivity is in the range of 1-2 kV/W at 1.63 THz and the optimal bias current is around 1/4-1/3 of the Ic at 4.2 K.
Keywords :
SQUIDs; bolometers; magnesium compounds; superconducting photodetectors; superconducting thin films; superconducting transition temperature; type II superconductors; HEB devices; MgB2; direct detection mode; frequency 0.6 THz; frequency 1.63 THz; frequency 2.2 GHz to 3 GHz; hot-electron bolometer mixers; maximum voltage responsivity; minimum noise temperatures; optimal bias current; receiver noise bandwidth; size 10 nm; size 20 nm; submicrometer size HEB; temperature 1150 K; temperature 700 K; terahertz frequency; Bandwidth; Bolometers; Films; Measurement by laser beam; Mixers; Noise; Temperature measurement; $hbox{MgB}_{2}$; HEB mixer; Hot-Electron Bolometer; MgB2; Terahertz detector; hot-electron bolometer; terahertz detector; thin film;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2014.2365134
Filename :
6936905
Link To Document :
