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Modeling of enhanced absorption and Raman scattering caused by plasmonic nanoparticle near fields

Authors
Journal
Journal of Quantitative Spectroscopy and Radiative Transfer
0022-4073
Publisher
Elsevier
Volume
113
Issue
18
Identifiers
DOI: 10.1016/j.jqsrt.2012.04.004
Keywords
  • Plasmonic
  • Solar Cell
  • Sers
  • Graphene
  • Fdtd
Disciplines
  • Design
  • Mathematics

Abstract

Abstract By assuming a simple dipole approximation for the plasmonic response of small metallic nanoparticles, we derive close-form analytical expressions for the overall absorption enhancement and Raman scattering enhancement expected in the material filling the space around them. Ohmic losses inside the nanoparticles as well as inter-nanoparticle plasmon coupling effects are incorporated in the model. A comparison with accurate numerical simulations shows excellent agreement for a wide range of nanoparticle volume filling ratios, core/shell geometries, and even in the case of mixing different types of metals. Even though a simplified geometry without interfaces has been adopted in these derivations, our expressions nevertheless are intuitive and can become great tools in understanding, designing and optimizing nanoparticle-based plasmonic devices.

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