Influence of phase transitions on the second harmonic generation in metal nanoparticles

S. Achilli*, M. Allione, A. M. Malvezzi, M. Patrini, A. Stella, P. Cheyssac, R. Kofman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this work we use nonlinear optical properties of Ga nanoparticles monolayers of different average sizes embedded in dielectric matrices to investigate the liquid-solid phase transitions in these materials. Ga nanoparticles, formed by exploiting the partial wetting of liquid Ga over a SiOx surface are irradiated with fs laser pulses from a Ti:sapphire source. The resulting Second Harmonic (SH) generated in the reflection and transmission directions is measured along the phase transitions by cooling the sample from 320 K down to liquid nitrogen temperature. Hysteresis cycles are observed in the nonlinear transmission, which exhibit a strong amplification from the solid to liquid values as compared to the linear optical results. A simple model for SH generation, based on Mie scattering calculations which includes the effect of surface plasmon resonance provides a fair key for the interpretation of the observed effects.

Original languageEnglish (US)
Pages (from-to)223-226
Number of pages4
JournalEuropean Physical Journal D
Volume24
Issue number1-3
DOIs
StatePublished - Jun 2003
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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