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Proceedings Paper

Optical trapping and sensing with plasmonic dipole antennas
Author(s): Weihua Zhang; Olivier J. F. Martin
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Paper Abstract

In this work, we study how to use a plasmonic dipole antenna as a multifunctional nanodevice for surface-enhanced Raman spectroscopy (SERS), localized surface plasmon resonance (LSPR) -based sensing and optical trapping. An analytical model is implemented to link the local electric field enhancement with the gradient forces, as well as the resonance shift caused by the presence of the analyte which can be a molecule or a nanoparticle. We find that a higher local field enhancement induces stronger trapping forces and a larger resonance wavelength shift. Experiments were also performed using plasmonic dipole antennas. Strong SERS signals were observed from the nanogap of an antenna, trapping of Au nanoparticles as small as 10 nm was achieved with a moderate laser power, and evident resonance shifts of the antenna associated with the trapping events were also observed. These results are consistent with our theoretical result that the giant field enhancement generated by a plasmonic dipole antenna also generates strong gradient forces and a high spectral sensitivity.

Paper Details

Date Published: 10 September 2010
PDF: 7 pages
Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 775712 (10 September 2010); doi: 10.1117/12.864225
Show Author Affiliations
Weihua Zhang, Ecole Polytechnique Fédérale de Lausanne (France)
Olivier J. F. Martin, Ecole Polytechnique Fédérale de Lausanne (France)

Published in SPIE Proceedings Vol. 7757:
Plasmonics: Metallic Nanostructures and Their Optical Properties VIII
Mark I. Stockman, Editor(s)

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