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Optics Express

Optics Express

  • Vol. 16, Iss. 16 — Aug. 4, 2008
  • pp: 12362–12371

Optically controlled interparticle distance tuning and welding of single gold nanoparticle pairs by photochemical metal deposition

T. Härtling, Y. Alaverdyan, A. Hille, M. T. Wenzel, M. Käll, and L. M. Eng  »View Author Affiliations

Optics Express, Vol. 16, Issue 16, pp. 12362-12371 (2008)

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We report on the in-situ controlled tuning of the particle gap in single pairs of gold nanodisks by photochemical metal deposition. The optically induced growth of nanodisk dimers fabricated by electron beam lithography leads to a decrease of the interparticle gap width down to 0 nm. Due to the increasing particle size and stronger plasmonic coupling, a smooth redshift of the localized surface plasmon (LSP) resonances is observed in such particle pairs during the growth process. The interparticle gap width, and hence the LSP resonance, can be tuned to any desired spectral position. The experimental results we obtain with this nanoscale fabrication technique are well described by the so-called plasmon ruler equation. Consequently, both the changes in particle diameter as well as in gap width can be characterized in-situ via far-field read-out of the optical properties of the dimers.

© 2008 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(350.5130) Other areas of optics : Photochemistry
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optical Design and Fabrication

Original Manuscript: May 16, 2008
Revised Manuscript: July 10, 2008
Manuscript Accepted: July 11, 2008
Published: August 1, 2008

T. Härtling, Y. Alaverdyan, A. Hille, M. T. Wenzel, M. Käll, and L. M. Eng, "Optically controlled interparticle distance tuning and welding of single gold nanoparticle pairs by photochemical metal deposition," Opt. Express 16, 12362-12371 (2008)

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