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Nano Lett. 2006 Dec;6(12):2639-41.

Creating hot nanoparticle pairs for surface-enhanced Raman spectroscopy through optical manipulation.

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  • 1Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.


We use optical tweezers to move single silver nanoparticles into near-field contact with immobilized particles, forming isolated surface-enhanced Raman spectroscopy (SERS) active Ag particle dimers. The surface-averaged SERS intensity increases by a factor approximately 20 upon dimerization. Electrodynamics calculations indicate that the final approach between the particles is due to "optical binding". The described methodology may facilitate controlled single molecule SERS analysis.

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