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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 8
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Phys. Rev. Lett. 102, 087401 (2009) [4 pages]

Measurement of Mechanical Forces Acting on Optically Trapped Dielectric Spheres Induced by Surface-Enhanced Raman Scattering

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Satish Rao1, Štefan Bálint1,2, Pål Løvhaugen1,3, Mark Kreuzer1, and Dmitri Petrov1,4,*
1ICFO - Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain
2Department of Biophysics, University of Pavol Jozef Šafárik, Košice, Slovak Republic 04154
3Department of Physics and Technology, University of Tromsø, Tromsø, Norway NO-9037
4ICREA - Institucio Catalana de Recerca i Estudis Avancats, 08010 Barcelona, Spain

Received 29 August 2008; published 23 February 2009

See accompanying Physics Focus

Surface enhanced Raman scattering (SERS) is studied from optically trapped dielectric spheres partially covered with silver colloids in a solution with SERS active molecules. The Raman scattering and Brownian motion of the sphere are simultaneously measured to reveal correlations between the enhancement of the Raman signal and average position of the sphere. The correlations are due to the momenta transfer of the emitted Raman photons from the probe molecules. The addition of a mechanical force measurement provides a different dimension to the study of Raman processes.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.087401
DOI:
10.1103/PhysRevLett.102.087401
PACS:
78.30.−j, 33.20.Fb, 78.67.Bf, 87.80.Cc

*Corresponding author.

Dmitri.Petrov@icfo.es

 
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