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Open Access Nano Express

Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell during initial stage of shell expansion

Victor K Pustovalov1* and Liudmila G Astafyeva2

Author Affiliations

1 Belarusian National Technical University, Independence pr. 65, Minsk, 220013, Belarus

2 B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Independence pr. 68, 220072, Minsk, Belarus

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Nanoscale Research Letters 2011, 6:448  doi:10.1186/1556-276X-6-448

Published: 12 July 2011

Abstract

Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell, created under laser heating of nanoparticle in water, were theoretically investigated. Vapor shell expansion leads to decreasing up to one to two orders of magnitude in comparison with initial values of scattering and extinction of the radiation with wavelengths 532 and 633 nm by system while shell radius is increased up to value of about two radii of nanoparticle. Subsequent increasing of shell radius more than two radii of nanoparticle leads to rise of scattering and extinction properties of system over initial values. The significant decrease of radiation scattering and extinction by system of nanoparticle-vapor shell can be used for experimental detection of the energy threshold of vapor shell formation and investigation of the first stages of its expansion.

PACS: 42.62.BE. 78.67. BF