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Proceedings Paper

Super-resolution imaging of diffusing analyte in surface-enhanced Raman scattering hot-spots
Author(s): Katherine A. Willets; Sarah M. Stranahan
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Paper Abstract

This paper describes recent efforts to characterize the diffusion of single molecule SERS analytes adsorbed to the surface of aggregated silver nanoparticles. Using a two-dimensional Gaussian function to fit the point spread function of a single diffraction-limited SERS emission image, the centroid of the emission can be located with precision better than 5nm. Tracking the centroid over time allows a diffusion trajectory to be constructed. By calculating the mean-r-squared displacement as a function of time lag, the diffusion properties of the SERS centroid can be tracked. For the single molecule SERS centroids presented herein, the diffusion analysis shows signatures of subdiffusion, indicating barriers to Brownian diffusion on the nanoparticle surface.

Paper Details

Date Published: 13 February 2012
PDF: 8 pages
Proc. SPIE 8228, Single Molecule Spectroscopy and Superresolution Imaging V, 82280P (13 February 2012); doi: 10.1117/12.908952
Show Author Affiliations
Katherine A. Willets, The Univ. of Texas at Austin (United States)
Sarah M. Stranahan, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 8228:
Single Molecule Spectroscopy and Superresolution Imaging V
Jörg Enderlein; Zygmunt Karol Gryczynski; Rainer Erdmann; Felix Koberling; Ingo Gregor, Editor(s)

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