Femtosecond tunneling response of surface plasmon polaritons

Ulrich Dieter Felix Keil, Taekjip Ha, Jacob Riis Jensen, Jørn Märcher Hvam

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    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. (C) 1998 American Institute of Physics. [S0003-6951(98)02223-2].
    Original languageEnglish
    JournalApplied Physics Letters
    Issue number23
    Pages (from-to)3074-3076
    Publication statusPublished - 1998

    Bibliographical note

    Copyright (1998) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


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