In a single gallium nanoparticulate, self-assembled (from an atomic beam) in a nano-aperture at the tip of a tapered optical fiber, we have observed evidence for a sequence of reversible light-induced transformations between five different structural phases (gamma - epsilon - delta - beta - liquid), stimulated by optical excitation at nanowatt power levels.
Cite
@article{arxiv.cond-mat/0503212,
title = {Light-induced structural transformations in a single gallium nanoparticulate},
author = {B. F. Soares and K. F. MacDonald and V. A. Fedotov and N. I. Zheludev},
journal= {arXiv preprint arXiv:cond-mat/0503212},
year = {2010}
}