Controlling the coexistence of structural phases and the optical properties of gallium nanoparticles with optical excitation

K. F. MacDonald, V. A. Fedotov, S. Pochon, G. Stevens, F. V. Kusmartsev, V. I. Emel'yanov, N. I. Zheludev

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We have observed reversible structural transformations, induced by optical excitation at 1.55 μm, between the β, γ and liquid phases of gallium in self-assembled gallium nanoparticles, with a narrow size distribution around 50 nm, 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.

Original languageBritish English
Pages (from-to)614-619
Number of pages6
JournalEurophysics Letters
Volume67
Issue number4
DOIs
StatePublished - Aug 2004

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