期刊
JOURNAL OF MODERN OPTICS
卷 61, 期 10, 页码 833-838出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2013.846432
关键词
laser induced field emission; nanotip; above threshold photoemission; photoelectron energy spectra
类别
资金
- Marie Curie ITN FASTQUAST, ANR contract labex NEXT [11 LABEX 075]
- region Midi-Pyrenees
We present an experiment studying the interaction of a strongly focused 25 fs laser pulse with a tungsten nanotip, investigating the different regimes of laser-induced electron emission. We study the dependence of the electron yield with respect to the static electric field applied to the tip. Photoelectron spectra are recorded using a retarding field spectrometer and peaks separated by the photon energy are observed with a 45% contrast. They are a clear signature of above threshold photoemission (ATP), and are confirmed by extensive spectrally resolved studies of the laser power dependence. Understanding these mechanisms opens the route to control experiment in the strong-field regime on nanoscale objects.
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