Nonlinear processes induced by the enhanced, evanescent field of surface plasmons excited by femtosecond laser pulses

N. Kroo, Gy Farkas, P. Dombi, S. Varró

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Evanescent fields of surface plasmon polaritons (SPP) above metal surfaces can reach 1-2 orders of magnitude higher, nearly atomic field strengths in comparison to the relatively weak exciting laser fields of a femtosecond Ti:sapphire laser oscillator. We used these high plasmonic fields to study the characteristic SPP phenomena of intense field optics experimentally. It was found that both the intensity and the angular distribution of SPP emitted light depend nonlinearly on the exciting laser intensity in the higher-intensity, non-perturbative range of the interactions. These results are supported by our theory. At these strong excitations, an additional, depolarized, diffuse spectrum also appeared which can be attributed either to the fluorescence of Au, or to the non-equlibrium Planck radiation, originating from the fast cooling of the conduction electron cloud of Au excited by the femtosecond laser pulse.

Original languageEnglish
Pages (from-to)21656-21661
Number of pages6
JournalOptics Express
Volume16
Issue number26
DOIs
Publication statusPublished - Dec 22 2008

Fingerprint

plasmons
polaritons
pulses
lasers
electron clouds
conduction electrons
metal surfaces
field strength
sapphire
angular distribution
oscillators
optics
cooling
fluorescence
radiation
excitation
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Nonlinear processes induced by the enhanced, evanescent field of surface plasmons excited by femtosecond laser pulses. / Kroo, N.; Farkas, Gy; Dombi, P.; Varró, S.

In: Optics Express, Vol. 16, No. 26, 22.12.2008, p. 21656-21661.

Research output: Contribution to journalArticle

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