TITLE

Static and optical field enhancement in metallic nanotips studied by two-photon photoemission microscopy and spectroscopy excited by picosecond laser pulses

AUTHOR(S)
Tsujino, S.; le Pimpec, F.; Raabe, J.; Buess, M.; Dehler, M.; Kirk, E.; Gobrecht, J.; Wrulich, A.
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The authors studied the photoemission from molybdenum nanotip arrays with controlled apex curvatures by photoelectron microscopy and spectroscopy excited by 10 ps visible laser pulses under dc electric field. While two-photon photoemission microscopy demonstrates the enhancement of photoabsorption at the sharp tip apex, spatially resolved analysis of the photoelectron energy revealed anomalous energy distribution that is ascribed to the dc field enhancement and resultant barrier reduction at the tip apex. The results show the applicability of photoelectron microscopy and spectroscopy to study the distribution of dc and optical electric field enhancement in field-emitter arrays.
ACCESSION #
36940982

 

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