Records |
Author |
Beck, M.; Klammer, M.; Lang, S.; Leiderer, P.; Kabanov, V. V.; Gol’tsman, G. N.; Demsar, J. |
Title |
Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy |
Type |
Miscellaneous |
Year |
2011 |
Publication |
arXiv |
Abbreviated Journal |
|
Volume |
|
Issue |
|
Pages |
|
Keywords |
NbN thin film, energy gap dynamics |
Abstract |
Using time-domain Terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparticle recombination rate, the Cooper pair-breaking rate and the electron-phonon coupling constant, \lambda = 1.1 +/- 0.1, which is in excellent agreement with theoretical estimates. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
Duplicated as 641 |
Approved |
no |
Call Number |
|
Serial |
1388 |
Permanent link to this record |
|
|
|
Author |
Beck, M.; Klammer, M.; Rousseau, I.; Gol’tsman, G. N.; Diamant, I.; Dagan, Y.; Demsar, J. |
Title |
Probing superconducting gap dynamics with THz pulses |
Type |
Conference Article |
Year |
2015 |
Publication |
CLEO |
Abbreviated Journal |
CLEO |
Volume |
|
Issue |
|
Pages |
SM3H.3 (1 to 2) |
Keywords |
superconducting gap; electric fields; femtosecond pulses; near infrared radiation; picosecond pulses; superconductors; thin films |
Abstract |
We studied superconducting gap dynamics in a BCS superconductor NbN and electron doped cuprate superconductor PCCO following excitation with near-infrared (NIR) and narrow band THz pulses. Systematic studies on PCCO imply very selective electron-phonon coupling. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Optical Society of America |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
|
Serial |
1345 |
Permanent link to this record |
|
|
|
Author |
Smirnov, K. V.; Vakhtomin, Yu. B.; Divochiy, A. V.; Ozhegov, R. V.; Pentin, I. V.; Slivinskaya, E. V.; Tarkhov, M. A.; Gol’tsman, G. N. |
Title |
Single-photon detectors for the visible and infrared parts of the spectrum based on NbN nanostructures |
Type |
Abstract |
Year |
2009 |
Publication |
Proc. Progress In Electromagnetics Research Symp. |
Abbreviated Journal |
Proc. Progress In Electromagnetics Research Symp. |
Volume |
|
Issue |
|
Pages |
863-864 |
Keywords |
SSPD, SNSPD |
Abstract |
The research by the group of Moscow State Pedagogical University into the hot-electron phenomena in thin superconducting films has led to the development of new types ofdetectors [1, 2] and their use both in fundamental and applied studies [3–6]. In this paper, wepresent the results of the development and fabrication of receiving systems for the visible andinfrared parts of the spectrum optimised for use in telecommunication systems and quantumcryptography. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
Moscow, Russia |
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
RPLAB @ sasha @ smirnovsession |
Serial |
1050 |
Permanent link to this record |
|
|
|
Author |
Huebers, H.-W.; Schubert, J.; Semenov, A.; Gol’tsman, G. N.; Voronov, B. M.; Gershenzon, E. M.; Schwaab, G. W. |
Title |
NbN phonon-cooled hot-electron bolometer as a mixer for THz heterodyne receivers |
Type |
Conference Article |
Year |
1999 |
Publication |
Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
Volume |
3828 |
Issue |
|
Pages |
410-416 |
Keywords |
NbN HEB mixers |
Abstract |
We have investigated a phonon-cooled NbN hot electron bolometric (HEB) mixer in the frequency range from 0.7 THz to 5.2 THz. The device was a 3.5 nm thin film with an in- plane dimension of 1.7 X 0.2 micrometers 2 integrated in a complementary logarithmic spiral antenna. The measured DSB receiver noise temperatures are 1500 K, 2200 K, 2600 K, 2900 K, 4000 K, 5600 K and 8800 K. The sensitivity fluctuation, the long term stability, and the antenna pattern were measured and the suitability of the mixer for a practical heterodyne receiver is discussed. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Spie |
Place of Publication |
|
Editor |
Chamberlain, J.M. |
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
Terahertz Spectroscopy and Applications II |
Notes |
|
Approved |
no |
Call Number |
|
Serial |
1477 |
Permanent link to this record |
|
|
|
Author |
Svechnikov, S. I.; Finkel, M. I.; Maslennikov, S. N.; Vachtomin, Y. B.; Smirnov, K. V.; Seleznev, V. A.; Korotetskaya, Y. P.; Kaurova, N. S.; Voronov, B. M.; Gol’tsman, G. N. |
Title |
Superconducting hot electron bolometer mixer for middle IR range |
Type |
Conference Article |
Year |
2006 |
Publication |
Proc. 16th Int. Crimean Microwave and Telecommunication Technology |
Abbreviated Journal |
Proc. 16th Int. Crimean Microwave and Telecommunication Technology |
Volume |
2 |
Issue |
|
Pages |
686-687 |
Keywords |
IR NbN HEB mixer, detector, GaAs substrate |
Abstract |
The developed directly lens coupled hot electron bolometer (HEB) mixer was based on 5 nm superconducting NbN deposited on GaAs substrate. The layout of the structure, including 30x20 mcm^2 active area coupled with a 50 Ohm coplanar line, was patterned by photolithography. The responsivity of the mixer was measured in a direct detection mode in the 25-64 THz frequency range. The noise performance of the mixer and the directivity of the receiver were investigated in a heterodyne mode. A 10.6 mum wavelength CW CO2 laser was utilized as a local oscillator. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
4023440 |
Serial |
1297 |
Permanent link to this record |