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Study of IF bandwidth of MgB2 phonon-cooled hot-electron bolometer mixers

Stella Bevilacqua (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; Sergey Cherednichenko (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; Vladimir Drakinskiy (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; Hiroyuki Shibata ; Yasuhiro Tokura ; Jan Stake (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik )
IEEE Transactions on Terahertz Science and Technology (2156-342X). Vol. 3 (2013), 4, p. 409-415.
[Artikel, refereegranskad vetenskaplig]

A noise bandwidth (NBW) of 6-7 GHz was obtained for Hot-Electron Bolometer (HEB) mixers made of 10 nm MgB2 films. A systematic investigation of the (IF) gain bandwidth as a function of the MgB2 film thickness (30 nm, 15 nm and 10 nm) is also presented. The gain bandwidth (GBW) of 3.4 GHz was measured for a 10 nm film, corresponding to a mixer time constant of 47 ps. For 10 nm films a reduction of the GBW was observed with the reduction of the critical temperature (Tc). Experimental data were analyzed using the two-temperature model. From the theoretical analysis, the electron-phonon time (τe-ph), the phonon escape time (τesc) and the electron and phonon specific heats (ce, cph) were extrapolated giving the first model for HEB mixers of MgB2 films.

Nyckelord: Bolometer, gain bandwidth, mixers, superconductor, terahertz, HEB



Denna post skapades 2013-02-25. Senast ändrad 2014-11-26.
CPL Pubid: 174093

 

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