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Proceedings Paper

Narrowing of nonlinear enhancements in near-field images
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Paper Abstract

In our attempt to reveal highly localized field enhancements on random metallic films using near-field scattering probe microscopy we experimentally demonstrated the existence of narrow peaks when using a monochromatic illumination. In order to get a better understanding of the second harmonic generation taking place on such films we have undertaken the same kind of near-field experiments using femtosecond lasers sources with high peak power able to induce the non linear response. These lasers have a spectral bandwidth associated with the pulse duration, which is in the femtosecond range. With such spectral broadening we have observed, as expected, a spatial broadening of the peaks at ω, which spread over distances in the 100-500 nm range. The behavior of the peaks is quite different at 2 ω: they are found to be always very well localized (~10 nm) despite of the polychromatic nature of the light; moreover there is no clear correlation between the peaks position at ω and those at 2 ω. This observation indicates, as often underlined in non linear processes, that coherent interactions involving a distribution of available frequencies in the lasers spectra take place. These frequencies ωn, coherently induce second harmonic generation as long as ωn + ωm = 2 ω.

Paper Details

Date Published: 3 October 2006
PDF: 6 pages
Proc. SPIE 6324, Plasmonics: Nanoimaging, Nanofabrication, and their Applications II, 632406 (3 October 2006); doi: 10.1117/12.679886
Show Author Affiliations
Samuel Grésillon, Lab. d'Optique Physique ESPCI, CNRS (France)
Univ. Pierre et Marie Curie (France)
Laurent Williame, Lab. d'Optique Physique ESPCI, CNRS (France)
Univ. Pierre et Marie Curie (France)
Eric le Moal, Lab. de Physique du Solide, Univ. Denis Diderot, ESPCI (France)
Emmanuel Fort, Lab. de Physique du Solide, Univ. Denis Diderot, ESPCI (France)
A. Claude Boccara, Lab. d'Optique Physique ESPCI, CNRS (France)
Univ. Pierre et Marie Curie (France)


Published in SPIE Proceedings Vol. 6324:
Plasmonics: Nanoimaging, Nanofabrication, and their Applications II
Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai, Editor(s)

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