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Gallium nanoparticles grow where light is

Gallium nanoparticles grow where light is
Gallium nanoparticles grow where light is
The study of metallic nanoparticles has a long tradition in linear and nonlinear optics [1], with current emphasis on the ultrafast dynamics, size, shape and collective effects in their optical response [2-6]. Nanoparticles also represent the ultimate confined geometry:high surface-to-volume ratios lead to local field enhancements and a range of dramatic modifications of the material's properties and phase diagram [7-9]. Confined gallium has become a subject of special interest as the light-induced structural phase transition recently observed in gallium films [10, 11] has allowed for the demonstration of all-optical switching devices that operate at low laser power [12]. Spontaneous self-assembly has been the main approach to the preparation of nanoparticles (for a review see 13). Here we report that light can dramatically influence the nanoparticle self-assembly process: illumination of a substrate exposed to a beam of gallium atoms results in the formation of nanoparticles with a relatively narrow size distribution. Very low light intensities, below the threshold for thermally-induced evaporation, exert considerable control over nanoparticle formation through non-thermal atomic desorption induced by electronic excitation.
MacDonald, K.F.
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Brocklesby, W.S.
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Emelyanov, V.I.
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Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Pochon, S.
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Ross, K.J.
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Stevens, G.C.
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Zheludev, N.I.
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MacDonald, K.F.
76c84116-aad1-4973-b917-7ca63935dba5
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Emelyanov, V.I.
5d5733ff-8ac4-4faf-8c8b-0086161a23a6
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Pochon, S.
8839cdca-fe45-4dee-b102-c75003565a84
Ross, K.J.
8438c1d1-b4f8-4b21-b948-b3ed038b9aa4
Stevens, G.C.
69d3fdbc-bb4c-4e7e-b066-2ec4f7f6986d
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

MacDonald, K.F., Brocklesby, W.S., Emelyanov, V.I., Fedotov, V.A., Pochon, S., Ross, K.J., Stevens, G.C. and Zheludev, N.I. (2001) Gallium nanoparticles grow where light is. Pre-print.

Record type: Article

Abstract

The study of metallic nanoparticles has a long tradition in linear and nonlinear optics [1], with current emphasis on the ultrafast dynamics, size, shape and collective effects in their optical response [2-6]. Nanoparticles also represent the ultimate confined geometry:high surface-to-volume ratios lead to local field enhancements and a range of dramatic modifications of the material's properties and phase diagram [7-9]. Confined gallium has become a subject of special interest as the light-induced structural phase transition recently observed in gallium films [10, 11] has allowed for the demonstration of all-optical switching devices that operate at low laser power [12]. Spontaneous self-assembly has been the main approach to the preparation of nanoparticles (for a review see 13). Here we report that light can dramatically influence the nanoparticle self-assembly process: illumination of a substrate exposed to a beam of gallium atoms results in the formation of nanoparticles with a relatively narrow size distribution. Very low light intensities, below the threshold for thermally-induced evaporation, exert considerable control over nanoparticle formation through non-thermal atomic desorption induced by electronic excitation.

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Published date: 1 May 2001

Identifiers

Local EPrints ID: 78935
URI: https://eprints.soton.ac.uk/id/eprint/78935
PURE UUID: 2458bf58-8c50-4189-9314-a17b4faf50b4
ORCID for K.F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976
ORCID for W.S. Brocklesby: ORCID iD orcid.org/0000-0002-2123-6712
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

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Date deposited: 11 Mar 2010
Last modified: 06 Jun 2018 13:12

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Contributors

Author: K.F. MacDonald ORCID iD
Author: W.S. Brocklesby ORCID iD
Author: V.I. Emelyanov
Author: V.A. Fedotov
Author: S. Pochon
Author: K.J. Ross
Author: G.C. Stevens
Author: N.I. Zheludev ORCID iD

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