Influence of phase transitions on the second harmonic generation in metal nanoparticles |
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Authors: | S Achilli M Allione A M Malvezzi M Patrini A Stella P Cheyssac and R Kofman |
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Institution: | (1) INFM - Dip. Fisica A. Volta, Università di Pavia, Via Bassi 6, 27100 Pavia, Italy;(2) INFM - Dip. Elettronica, Università di Pavia, Via Ferrata 1, 27100 Pavia, Italy;(3) Laboratoire de la Physique de la Matière Condensée, URA 190, Université de Nice Sophia Antipolis, 06108 Nice Cedex, France |
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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. |
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Keywords: | 78 66 Vs Fine-particle systems 61 25 Mv Liquid
metals and alloys 42 65 Ky Frequency conversion harmonic
generation including higher-order harmonic generation |
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