Open AccessSuppression of surface plasmon resonance in Au nanoparticles upon transition to the liquid state
Author(s) -
V. S. Gerasimov,
A. E. Ershov,
A. P. Gavrilyuk,
С. В. Карпов,
Hans Ågren,
Sergey Polyutov
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.026851
Subject(s) - plasmon , materials science , surface plasmon resonance , nanoparticle , plasmonic nanoparticles , surface plasmon , mie scattering , scattering , molecular physics , relaxation (psychology) , localized surface plasmon , condensed matter physics , optics , light scattering , optoelectronics , nanotechnology , chemistry , psychology , social psychology , physics
Significant suppression of resonant properties of single gold nanoparticles at the surface plasmon frequency during heating and subsequent transition to the liquid state has been demonstrated experimentally and explained for the first time. The results for plasmonic absorption of the nanoparticles have been analyzed by means of Mie theory using experimental values of the optical constants for the liquid and solid metal. The good qualitative agreement between calculated and experimental spectra support the idea that the process of melting is accompanied by an abrupt increase of the relaxation constants, which depends, beside electron-phonon coupling, on electron scattering at a rising number of lattice defects in a particle upon growth of its temperature, and subsequent melting as a major cause for the observed plasmonic suppression. It is emphasized that observed effect is fully reversible and may underlie nonlinear optical responses of nanocolloids and composite materials containing plasmonic nanoparticles and their aggregates in conditions of local heating and in general, manifest itself in a wide range of plasmonics phenomena associated with strong heating of nanoparticles.