Open AccessMonitoring the aspect ratio distribution of colloidal gold nanoparticles under pulsed-laser exposure
Author(s) -
Yehia Mansour,
Yann Battie,
A. En Naciri,
Nouari Chaoui
Publication year - 2020
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.399831
Subject(s) - fluence , nanorod , materials science , optics , laser , colloidal gold , extinction (optical mineralogy) , spectroscopy , irradiation , nanoparticle , nanotechnology , physics , quantum mechanics , nuclear physics
We propose an advanced in situ extinction spectroscopy set up to investigate the dynamic of the fragmentation and reshaping processes of gold colloids during a ns-laser pulse exposure. The evolution of the aspect ratio distribution of gold nanorods (NRs) during the laser exposure is obtained by analyzing each spectra with the shape distributed effective medium theory. We demonstrate that the kinetics of NR shape transformation can be divided into two fluence regimes. At small fluence, the kinetic is limited by the NRs orientation, while at high fluence, the fragmentation rate is only limited by the probability of NRs to be located in the irradiated volume.