Femtosecond tunneling response of surface plasmon polaritons
作者:
Ulrich D. Keil,
Taekjip Ha,
Jacob R. Jensen,
Jo&slash;rn M. Hvam,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 23
页码: 3074-3076
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.121545
出版商: AIP
数据来源: AIP
摘要:
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. ©1998 American Institute of Physics.
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