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Communication Dans Un Congrès Année : 2005

Surface-Enhanced Raman Scattering in Noble-Metal Nanoparticles: a Microscopic Approach

V.-N. Pustovit
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  • PersonId : 842002
T. Shahbazyan
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  • PersonId : 842003

Résumé

We present a microscopic model for surface-enhanced Raman scattering (SERS) from molecules adsorbed on small noble-metal nanoparticles. We demonstrate that, in nanometer-sized particles, SERS is determined by a competition between two distinct quantum-size effects: Landau damping of surface plasmon resonance and reduced screening near nanoparticle surface. The first mechanism comes from the discreteness of energy spectrum in a nanoparticle and leads to a general decrease in SERS. The second mechanism originates from the different effect of confining potential on sp-band and d-band electron states and leads to relative increase in SERS. We calculate numerically the spatial distribution of local field near the surface and the enhancement factor for different nanoparticles sizes.
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Dates et versions

hal-00166999 , version 1 (14-08-2007)

Identifiants

  • HAL Id : hal-00166999 , version 1

Citer

V.-N. Pustovit, T. Shahbazyan. Surface-Enhanced Raman Scattering in Noble-Metal Nanoparticles: a Microscopic Approach. ENS 2005, Dec 2005, Paris, France. pp.154-158. ⟨hal-00166999⟩

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