Optical detection of the superconducting proximity effect

Laura H. Greene, A. C. Abeyta, Igor V. Roshchin, I. K. Robinson, J. F. Dorsten, T. A. Tanzer, Paul W. Bohn

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present the first detection of a superconducting proximity effect by optical techniques. Raman scattering on n +-InAs is performed through very thin, high-quality, superconducting Nb films grown directly on the (100)InAs surface. The 6 to 10 nm thick Nb films exhibit T cs of 2.5 to 5.5 K, as measured by electronic transport, and are flat to approximately 0.5 nm, as measured by x-ray reflectivity. As the Nb/InAs structure is cooled below the superconducting transition temperature, the magnitude of the unscreened LO phonon mode, associated with the surface charge accumulation layer in the InAs, is observed to be enhanced by more than 40%. This reversible change is observed only when the Nb is in good electrical contact with the InAs.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsI. Bozovic, D. van der Marel
Number of pages8
StatePublished - 1996
Externally publishedYes
EventSpectroscopic Studies of Superconductors. Part 2 (of 2) - San Jose, CA, USA
Duration: Jan 29 1996Feb 1 1996

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering


OtherSpectroscopic Studies of Superconductors. Part 2 (of 2)
CitySan Jose, CA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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