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- W3132739127 abstract "This work aims to provide a simple yet complete effective dielectric function for an anisotropic layer of polarizable molecules adsorbed on a metallic surface. This effective medium model considers the important and nontrivial case of nonvacuum embedding media and accounts for orientation effects, coverage dependence through dipole-dipole interactions, and image-dipole effects. To check the model's validity, we focus in particular on the experimentally relevant case of dyes adsorbed on metallic nanospheres. We can then use anisotropic Mie theory, together with the effective dielectric function describing the molecular coating, to calculate their optical properties. We show that this effective medium description is in very good agreement with more elaborate and computationally intensive microscopic calculations based on coupled-dipole models. The effective medium model therefore provides a simple means to investigate orientation effects and coverage dependence, including in more complex systems such as dyes adsorbed on nonspherical or ensembles of nanoparticles. This model can readily be used to further our theoretical understanding of dye-nanoparticle systems, for example in the context of dye-plasmon resonance coupling or surface-enhanced Raman and fluorescence spectroscopy." @default.
- W3132739127 created "2021-03-01" @default.
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- W3132739127 date "2021-02-24" @default.
- W3132739127 modified "2023-09-25" @default.
- W3132739127 title "Refined effective-medium model for the optical properties of nanoparticles coated with anisotropic molecules" @default.
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- W3132739127 doi "https://doi.org/10.1103/physrevb.103.085436" @default.
- W3132739127 hasPublicationYear "2021" @default.
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