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Surface-enhanced Raman spectroscopy: nonlocal limitations |
Optics Letters, Vol. 37, Issue 13, pp. 2538-2540 (2012)
http://dx.doi.org/10.1364/OL.37.002538
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Abstract
Giant field enhancement and field singularities are a natural consequence of the commonly employed local-response framework. We show that a more general nonlocal treatment of the plasmonic response leads to new and possibly fundamental limitations on field enhancement with important consequences for our understanding of surface-enhanced Raman spectroscopy (SERS). The intrinsic length scale of the electron gas serves to smear out assumed field singularities, leaving the SERS enhancement factor finite, even for geometries with infinitely sharp features. For silver nanogroove structures, mimicked by periodic arrays of half-cylinders (up to 120 nm in radius), we find no enhancement factors exceeding 10 orders of magnitude (
© 2012 Optical Society of America
OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(290.5860) Scattering : Scattering, Raman
(300.6450) Spectroscopy : Spectroscopy, Raman
ToC Category:
Spectroscopy
History
Original Manuscript: March 8, 2012
Revised Manuscript: May 1, 2012
Manuscript Accepted: May 10, 2012
Published: June 21, 2012
Virtual Issues
Vol. 7, Iss. 9 Virtual Journal for Biomedical Optics
Citation
G. Toscano, S. Raza, S. Xiao, M. Wubs, A.-P. Jauho, S. I. Bozhevolnyi, and N. A. Mortensen, "Surface-enhanced Raman spectroscopy: nonlocal limitations," Opt. Lett. 37, 2538-2540 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-13-2538
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