Femtosecond tunneling response of surface plasmon polaritons

Ulrich D. Keil, Taekjip Ha, Jacob R. Jensen, Jørn M. Hvam

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We obtain femtosecond (200 fs) time resolution using a scanning tunneling microscope on surface plasmon polaritons (SPPs) generated by two 100 fs laser beams in total internal reflection geometry. The tunneling gap dependence of the signal clearly indicates the tunneling origin of the signal and suggests that nanometer spatial resolution can be obtained together with femtosecond temporal resolution. This fast response, in contrast to the picosecond decay time of SPPs revealed by differential reflectivity measurements, can be attributed to a coherent superposition of SPPs rectified at the tunneling junction.

Original languageEnglish (US)
Pages (from-to)3074-3076
Number of pages3
JournalApplied Physics Letters
Issue number23
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Femtosecond tunneling response of surface plasmon polaritons'. Together they form a unique fingerprint.

Cite this