Surface-enhanced Raman spectroscopy: nonlocal limitations

Giuseppe Toscano, Søren Raza, Sanshui Xiao, Martijn Wubs, Antti-Pekka Jauho, Sergey I. Bozhevolnyi, N. Asger Mortensen

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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 (1010).

Original languageEnglish
JournalOptics Letters
Volume37
Issue number13
Pages (from-to)2538-2540
ISSN0146-9592
DOIs
Publication statusPublished - 2012

Bibliographical note

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-37-13-2538. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Cite this

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title = "Surface-enhanced Raman spectroscopy: nonlocal limitations",
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 (1010).",
author = "Giuseppe Toscano and S{\o}ren Raza and Sanshui Xiao and Martijn Wubs and Antti-Pekka Jauho and Bozhevolnyi, {Sergey I.} and Mortensen, {N. Asger}",
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Surface-enhanced Raman spectroscopy: nonlocal limitations. / Toscano, Giuseppe; Raza, Søren; Xiao, Sanshui ; Wubs, Martijn; Jauho, Antti-Pekka; Bozhevolnyi, Sergey I.; Mortensen, N. Asger.

In: Optics Letters, Vol. 37, No. 13, 2012, p. 2538-2540.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Surface-enhanced Raman spectroscopy: nonlocal limitations

AU - Toscano, Giuseppe

AU - Raza, Søren

AU - Xiao, Sanshui

AU - Wubs, Martijn

AU - Jauho, Antti-Pekka

AU - Bozhevolnyi, Sergey I.

AU - Mortensen, N. Asger

N1 - This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-37-13-2538. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

PY - 2012

Y1 - 2012

N2 - 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 (1010).

AB - 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 (1010).

U2 - 10.1364/OL.37.002538

DO - 10.1364/OL.37.002538

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SN - 0146-9592

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