Ultrashort, angstrom-scale decay of surface-enhanced raman scattering at hot spots

Gayatri K. Joshi, Sarah L. White, Merrell A. Johnson, Rajesh Sardar, Prashant Jain

Research output: Contribution to journalArticle

Abstract

Anisotropic plasmonic nanostructures are known to exhibit large enhancements of surface-enhanced Raman scattering (SERS) of adsorbed molecules at their sharp tips or edges, where the near-field is intense. We show that the SERS enhancement at such field hot spots decays over a distance of ca. 4 Å, much shorter than the typical decay length reported for SERS. The finding is made in SERS sensors constructed from chemically synthesized triangular nanoprisms with azobenzene reporter molecules linked to the nanoprism surface using variable chain length alkanethiol spacers. With the aid of electrodynamic simulations, the ultrashort decay length, the shortest reported to date, is explained by solely an electromagnetic field effect. Our work provides a key design consideration for the use of hot spots of anisotropic nanostructures for SERS. The angstrom-scale effect may also allow the achievement of intramolecular spatial resolution in SERS probing.

Original languageEnglish (US)
Pages (from-to)24973-24981
Number of pages9
JournalJournal of Physical Chemistry C
Volume120
Issue number43
DOIs
StatePublished - Nov 3 2016

Fingerprint

Raman scattering
Raman spectra
decay
Nanostructures
Electromagnetic field effects
scale effect
Molecules
Azobenzene
augmentation
Electrodynamics
Chain length
electrodynamics
spacers
molecules
near fields
electromagnetic fields
spatial resolution
sensors
Sensors
simulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Ultrashort, angstrom-scale decay of surface-enhanced raman scattering at hot spots. / Joshi, Gayatri K.; White, Sarah L.; Johnson, Merrell A.; Sardar, Rajesh; Jain, Prashant.

In: Journal of Physical Chemistry C, Vol. 120, No. 43, 03.11.2016, p. 24973-24981.

Research output: Contribution to journalArticle

Joshi, Gayatri K. ; White, Sarah L. ; Johnson, Merrell A. ; Sardar, Rajesh ; Jain, Prashant. / Ultrashort, angstrom-scale decay of surface-enhanced raman scattering at hot spots. In: Journal of Physical Chemistry C. 2016 ; Vol. 120, No. 43. pp. 24973-24981.
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