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Proc Natl Acad Sci U S A. 2004 Dec 28;101(52):17930-5. Epub 2004 Dec 17.

Surface-enhanced Raman scattering on tunable plasmonic nanoparticle substrates.

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  • 1Department of Physics and Astronomy, Laboratory of Nanophotonics, and Rice Quantum Institute, Rice University, Houston, TX 77005, USA.


Au and Ag nanoshells are investigated as substrates for surface-enhanced Raman scattering (SERS). We find that SERS enhancements on nanoshell films are dramatically different from those observed on colloidal aggregates, specifically that the Raman enhancement follows the plasmon resonance of the individual nanoparticles. Comparative finite difference time domain calculations of fields at the surface of smooth and roughened nanoshells reveal that surface roughness contributes only slightly to the total enhancement. SERS enhancements as large as 2.5 x 10(10) on Ag nanoshell films for the nonresonant molecule p-mercaptoaniline are measured.

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