Plasmonic coupling of SiO2 -Ag "post-cap" nanostructures and silver film for surface enhanced Raman scattering

Hsin Yu Wu; Brian T. Cunningham

doi:10.1063/1.3555342

Plasmonic coupling of SiO₂ -Ag "post-cap" nanostructures and silver film for surface enhanced Raman scattering

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Abstract

We demonstrate a surface enhanced Raman scattering (SERS) substrate consisting of SiO₂ -Ag "post-cap" nanostructures with an underlying silver film fabricated by the glancing angle deposition technique. Electromagnetic simulations predict that SERS enhancement is strongly polarization-dependent, consistent with experimental measurements. Optimized coupling between Ag cap nanoparticles and the underlying silver film can be achieved by controlling the thickness of SiO₂ post sandwiched between them to significantly enhance local electric-field intensity and to increase the density of electromagnetic hot spots. A maximum SERS enhancement factor of 2.38× 10⁹ within the hot spot region is demonstrated, providing sufficient sensitivity for many important applications.

Original language	English (US)
Article number	153103
Journal	Applied Physics Letters
Volume	98
Issue number	15
DOIs	https://doi.org/10.1063/1.3555342
State	Published - Apr 11 2011

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Online availability

10.1063/1.3555342

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Cite this

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title = "Plasmonic coupling of SiO2 -Ag {"}post-cap{"} nanostructures and silver film for surface enhanced Raman scattering",

abstract = "We demonstrate a surface enhanced Raman scattering (SERS) substrate consisting of SiO2 -Ag {"}post-cap{"} nanostructures with an underlying silver film fabricated by the glancing angle deposition technique. Electromagnetic simulations predict that SERS enhancement is strongly polarization-dependent, consistent with experimental measurements. Optimized coupling between Ag cap nanoparticles and the underlying silver film can be achieved by controlling the thickness of SiO2 post sandwiched between them to significantly enhance local electric-field intensity and to increase the density of electromagnetic hot spots. A maximum SERS enhancement factor of 2.38× 109 within the hot spot region is demonstrated, providing sufficient sensitivity for many important applications.",

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note = "Funding Information: This work was supported by the National Science Foundation under Award No. CBET 07-54122 and ECCS 09-24062.",

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AU - Cunningham, Brian T.

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AB - We demonstrate a surface enhanced Raman scattering (SERS) substrate consisting of SiO2 -Ag "post-cap" nanostructures with an underlying silver film fabricated by the glancing angle deposition technique. Electromagnetic simulations predict that SERS enhancement is strongly polarization-dependent, consistent with experimental measurements. Optimized coupling between Ag cap nanoparticles and the underlying silver film can be achieved by controlling the thickness of SiO2 post sandwiched between them to significantly enhance local electric-field intensity and to increase the density of electromagnetic hot spots. A maximum SERS enhancement factor of 2.38× 109 within the hot spot region is demonstrated, providing sufficient sensitivity for many important applications.

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