Cooper Pair Breaking in Lead Measured By Pulsed Terahertz Spectroscopy

J. F. Federici, B. I. Greene, P. N. Saeta, D. R. Dykaar, F. Sharifi, R. C. Dynes

Research output: Contribution to journalComment/debatepeer-review

3 Scopus citations


We use a new technique of characterizing pulsed far-infrared radiation with a demonstrated resolution of ~100fs to directly measure 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.

Original languageEnglish (US)
Pages (from-to)1461-1464
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
StatePublished - Mar 1993

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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