Nanoparticles and Nanostructures

Surface-Enhanced Femtosecond Stimulated Raman Spectroscopy

Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
J. Phys. Chem. Lett., 2011, 2 (10), pp 1199–1203
DOI: 10.1021/jz200498z
Publication Date (Web): April 29, 2011
Copyright © 2011 American Chemical Society
*E-mail: vanduyne@northwestern.edu. Phone: 847.491.3516. Fax: 847.491.7713.

Abstract

Abstract Image

Surface-enhanced Raman spectroscopy (SERS) and femtosecond stimulated Raman spectroscopy (FSRS) have revolutionized the Raman spectroscopy field. SERS provides spectroscopic detection of single molecules, and FSRS enables the acquisition of Raman spectra on the ultrafast time scale of molecular motion. Here, we present the first successful combination of these two techniques, demonstrating surface-enhanced femtosecond stimulated Raman spectroscopy (SE-FSRS) using gold nanoantennas with embedded reporter molecules. Using a picosecond Raman and femtosecond probe pulse, the time- and ensemble-averaged enhancement factor is estimated to be in the range of 104–106. We report the line shapes, power dependence, and magnitude of the SE-FSRS signal and discuss contributions to sample degradation on the minute time scale. With these first successful proof-of-principle experiments, time-resolved SE-FSRS techniques can now be rationally attempted with the goals of investigating the dynamics of plasmonic materials as well as examining the contributions of environmental heterogeneities by probing more homogeneous molecular subsets.

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Article Views: 2,841 Times
Received 12 April 2011
Date accepted 27 April 2011
Published online 29 April 2011
Published in print 19 May 2011
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