Title :
Cooper pair breaking in lead measured by pulsed terahertz spectroscopy
Author :
Federici, J.F. ; Greene, B.I. ; Saeta, P.N. ; Dykaar, D.R. ; Sharifi, F. ; Dynes, R.C.
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
A technique for characterizing pulsed far-infrared radiation with a demonstrated resolution of approximately 100 fs is used to measure directly Cooper pair breaking in superconducting lead. A 100-fs pulse of visible light is used to excite a thin-film lead sample while the Cooper pair density is optically probed using a pulse of broadband far-infrared radiation. Subsequent to the absorption of the visible pulse, a rapid (<1 ps) change in the far-infrared optical transmission is observed, corresponding to the breaking of Cooper pairs. These results have implications for thin-film superconducting transmission lines carrying short electrical pulses.<>
Keywords :
Cooper pairs; lead; light transmission; superconducting thin films; transmission lines; type I superconductors; Cooper pair breaking; Pb; far-infrared optical transmission; pulsed far-infrared radiation; pulsed terahertz spectroscopy; short electrical pulses; superconductor; thin-film; transmission lines; Finite impulse response filter; Lead; Optical films; Optical pulses; Pulse measurements; Spectroscopy; Submillimeter wave measurements; Superconducting films; Superconducting transmission lines; Transmission line measurements;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
