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The Influence of the Asymmetry of the Geometry of a Core–Shell Particle on a Substrate on the Optical Characteristics Accounting for Spatial Dispersion

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Moscow University Physics Bulletin Aims and scope

Abstract

The problem of excitation of a core–shell particle located on a transparent substrate by a field of an evanescent electromagnetic wave is considered. The particle consists of a dielectric core with a metal nanoplasmonic shell in which spatial dispersion occurs. Based on the Discrete Sources Method, a model has been constructed that considers the influence of the presence of the substrate and nonlocality in a metal on the optical scattering characteristics. The effect of the asymmetry of the particle geometry on the optical characteristics of the near field has been investigated. It was found that the asymmetry of the particle geometry significantly affects the intensity enhancement coefficient, as well as the absorption cross-section.

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ACKNOWLEDGMENTS

This work was supported by the Moscow Center for Fundamental and Applied Mathematics (project: ‘‘The modeling of elements of a plasmonic nanolaser considering quantum nonlocality.’’)

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Authors and Affiliations

  1. Department of Computational Mathematics and Cybernetics, Moscow State University, 19991, Moscow, Russia

    Yu. A. Eremin

  2. Department of Physics, Moscow State University, 19991, Moscow, Russia

    A. G. Sveshnikov

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  1. Yu. A. Eremin
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  2. A. G. Sveshnikov
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Correspondence to Yu. A. Eremin or A. G. Sveshnikov.

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Translated by D. Churochkin

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Eremin, Y.A., Sveshnikov, A.G. The Influence of the Asymmetry of the Geometry of a Core–Shell Particle on a Substrate on the Optical Characteristics Accounting for Spatial Dispersion. Moscow Univ. Phys. 75, 480–487 (2020). https://doi.org/10.3103/S0027134920050100

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