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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 4 — May. 4, 2011

Polarization mapping of nanoparticle plasmonic coupling

Matthew J. Crow, Kevin Seekell, and Adam Wax  »View Author Affiliations


Optics Letters, Vol. 36, Issue 5, pp. 757-759 (2011)
http://dx.doi.org/10.1364/OL.36.000757


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Abstract

We propose the use of polarization mapping as a tool to better separate the effects of plasmonic coupling from the local refractive index for molecular imaging and biosensing using gold nanoparticles. Polarization mapping allows identification of the orthogonal excitation mode when the particle dimer orientation is unknown, as may be the case when using plasmonic nanoparticles for cell labeling. This information can be used to sense relative changes in the dielectric environment, or for absolute dielectric sensing with additional a priori interparticle distance information. First, the theoretical scattering by nanoparticle pairs is modeled under parallel and orthogonal polarization orientations and increasing interparticle separation. Second, polarization mapping of substrate bound nanoparticles using dark-field microspectroscopy is investigated as a method to isolate the individual plasmonic coupling modes associated with a pair of nanoparticles without reorientation of the sample. The results of this study provide useful insight toward potential avenues for monitoring distances using plasmonic nanoparticles and sensing the local refractive index using nanoparticle pairs when the pair orientation is not known, as may be the case when using nanoparticles for cell receptor labeling.

© 2011 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(290.0290) Scattering : Scattering
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Scattering

History
Original Manuscript: November 12, 2010
Revised Manuscript: January 16, 2011
Manuscript Accepted: February 2, 2011
Published: March 1, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Matthew J. Crow, Kevin Seekell, and Adam Wax, "Polarization mapping of nanoparticle plasmonic coupling," Opt. Lett. 36, 757-759 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-36-5-757


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