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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 2 — Jan. 23, 2006
  • pp: 847–857

Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering

Nicolas M. B. Perney, Jeremy J. Baumberg, Majd E. Zoorob, Martin D. B. Charlton, Sven Mahnkopf, and Caterina M. Netti  »View Author Affiliations

Optics Express, Vol. 14, Issue 2, pp. 847-857 (2006)

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Comprehensive reflectivity mapping of the angular dispersion of nanostructured arrays comprising of inverted pyramidal pits is demonstrated. By comparing equivalently structured dielectric and metallic arrays, diffraction and plasmonic features are readily distinguished. While the diffraction features match expected theory, localised plasmons are also observed with severely flattened energy dispersions. Using pit arrays with identical pitch, but graded pit dimensions, energy scaling of the localised plasmon is observed. These localised plasmons are found to match a simple model which confines surface plasmons onto the pit sidewalls thus allowing an intuitive picture of the plasmons to be developed. This model agrees well with a 2D finite-difference time-domain simulation which shows the same dependence on pit dimensions. We believe these tuneable plasmons are responsible for the surface-enhancement of the Raman scattering (SERS) of an attached layer of benzenethiol molecules. Such SERS substrates have a wide range of applications both in security, chemical identification, environmental monitoring and healthcare.

© 2006 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.1960) Physical optics : Diffraction theory
(260.3910) Physical optics : Metal optics
(300.6450) Spectroscopy : Spectroscopy, Raman
(350.2770) Other areas of optics : Gratings

ToC Category:
Optics at Surfaces

Virtual Issues
Vol. 1, Iss. 2 Virtual Journal for Biomedical Optics

Nicolas M.B. Perney, Jeremy J. Baumberg, Majd E. Zoorob, Martin D. B. Charlton, Sven Mahnkopf, and Caterina M. Netti, "Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering," Opt. Express 14, 847-857 (2006)

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