Volume 67, Number 4, August 2004
|Page(s)||614 - 619|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 August 2004|
Controlling the coexistence of structural phases and the optical properties of gallium nanoparticles with optical excitation
School of Physics and Astronomy, University of Southampton Highfield, Southampton, SO17 1BJ, UK
2 Department of Physics, Loughborough University - Loughborough, LE11 3TU, UK
3 Department of Physics and International Laser Centre, Moscow State University Vorobievy Gori, 119899 Moscow, Russia
Accepted: 7 June 2004
We have observed reversible structural transformations, induced by optical excitation at 1.55, between the β, γ and liquid phases of gallium in self-assembled gallium nanoparticles, with a narrow size distribution around 50, on the tip of an optical fiber. Only a few tens of nanowatts of optical excitation per particle are required to control the transformations, which take the form of a dynamic phase coexistence and are accompanied by substantial changes in the optical properties of the nanoparticle film. The time needed to achieve phase equilibrium is in the microsecond range, and increases sharply near the transition temperatures.
PACS: 64.70.Nd – Structural transitions in nanoscale materials / 78.67.Bf – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures: Nanocrystals and nanoparticles / 68.35.Rh – Solid surfaces and solid-solid interfaces: Structure and energetics: Phase transitions and critical phenomena
© EDP Sciences, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.