- Published on 05 November 2014
A deep understanding of the internal dynamics of metal nanoparticles, through the measurement of their time resolved optical response, requires detailed modeling of the physical processes involved. This EPJ B Colloquium explores the nonlinear ultrafast optical response of metal nanoparticles which can be obtained experimentally in ensembles and single nanoparticles, through femtosecond pump-probe spectroscopy.
The relationship between this response and the electronic and lattice kinetics of the metal is studied using a model that describes the wavelength and time-dependent modifications of the material's dielectric function. This model is useful to study single silver nanospheres and gold nanorods, as well as ensembles of noble metal nanoparticles and metal–semiconductor nano-hybrids.
The quantitative analysis presented in this Colloquium enables also the elucidation of the physical mechanisms at the origin of ultrafast nonlinearities in confined metals at different timescales.
Tatjana Stoll, Paolo Maioli, Aurélien Crut, Natalia Del Fatti, and Fabrice Vallée (2014),
Advances in femto-nano-optics: ultrafast nonlinearity of metal nanoparticles,
European Physical Journal B, DOI: DOI: 10.1140/epjb/e2014-50515-4