Plasmon resonances on metal tips: Understanding tip-enhanced Raman scattering

A L Demming; F Festy; D Richards

doi:10.1063/1.1896356

Plasmon resonances on metal tips: Understanding tip-enhanced Raman scattering

A L Demming, F Festy, D Richards

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Abstract

Calculations of the electric-field enhancements in the vicinity of an illuminated silver tip, modeled using a Drude dielectric response, have been performed using the finite difference time domain method. Tip-induced field enhancements, of application in "apertureless" Raman scanning near-field optical microscopy (SNOM), result from the resonant excitation of plasmons on the metal tip. The sharpness of the plasmon resonance spectrum and the highly localized nature of these modes impose conditions to better exploit tip plasmons in tip-enhanced apertureless SNOM. The effect of tip-to-substrate separation and polarization on the resolution and enhancement are analyzed, with emphasis on the different field components parallel and perpendicular to the substrate. (c) 2005 American Institute of Physics

Original language	English
Article number	184716
Journal	Journal of Chemical Physics
Volume	122
Issue number	18
DOIs	https://doi.org/10.1063/1.1896356
Publication status	Published - 8 May 2005

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2005 Journal Of Chemical Physics Plasmon resonances on metal tips Understanding tip enhanced Raman scatteringSubmitted manuscript, 439 KB

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abstract = "Calculations of the electric-field enhancements in the vicinity of an illuminated silver tip, modeled using a Drude dielectric response, have been performed using the finite difference time domain method. Tip-induced field enhancements, of application in {"}apertureless{"} Raman scanning near-field optical microscopy (SNOM), result from the resonant excitation of plasmons on the metal tip. The sharpness of the plasmon resonance spectrum and the highly localized nature of these modes impose conditions to better exploit tip plasmons in tip-enhanced apertureless SNOM. The effect of tip-to-substrate separation and polarization on the resolution and enhancement are analyzed, with emphasis on the different field components parallel and perpendicular to the substrate. (c) 2005 American Institute of Physics",

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AU - Festy, F

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AB - Calculations of the electric-field enhancements in the vicinity of an illuminated silver tip, modeled using a Drude dielectric response, have been performed using the finite difference time domain method. Tip-induced field enhancements, of application in "apertureless" Raman scanning near-field optical microscopy (SNOM), result from the resonant excitation of plasmons on the metal tip. The sharpness of the plasmon resonance spectrum and the highly localized nature of these modes impose conditions to better exploit tip plasmons in tip-enhanced apertureless SNOM. The effect of tip-to-substrate separation and polarization on the resolution and enhancement are analyzed, with emphasis on the different field components parallel and perpendicular to the substrate. (c) 2005 American Institute of Physics

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JO - Journal of Chemical Physics

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ER -

Plasmon resonances on metal tips: Understanding tip-enhanced Raman scattering

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