Optical response of dielectric&metal-core/metal-shell nanoparticles: Near electromagnetic field and resonance frequencies

O. Rocha-Rocha*, S. Gaste´lum-Acun˜a, M. Flores-Acosta, R. Garc´ıa-Llamas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We study the diffraction of a monochromatic electromagnetic plane wave by a dielectric&metal-core/metal-shell nanoparticle surrounded by a dielectric medium. This problem was solved by using generalized Mie’s theory and both the scattering cross section and the square module of the electric field were calculated as a function of shell thickness. Numerically, the first particles studied were gold-core/silver-shell nanoparticles and their inverse configuration. The gold-core/silver-shell particle presented more variation of their optical properties. The second particles were vacuum-core/metal-shell surrounded by vacuum, symmetric configurations. In this case, the dispersive Drude dielectric function for the metal was used, and a comparative study between the positions of the resonance frequencies obtained from quasi-static limit and electrodynamic theory was performed. Thus, consequently the formula obtained from the quasi-static limit can be used to calculate the positions of the resonance frequencies instead of the electrodynamic theory, when the external radius is smaller than 20 nm.

Original languageEnglish
Article number031302
JournalRevista Mexicana de Fisica
Volume68
Issue number3
DOIs
StatePublished - May 2022

Bibliographical note

Funding Information:
The author O. Rocha-Rocha acknowledges support from CONACyT scholarships. The author S. Gastélum-Acuña acknowledges support from Investigadoras e Investigadores por México del CONACyT.

Publisher Copyright:
© 2022

Keywords

  • Core/shell nanoparticle
  • quasi-static limit
  • resonance frequencies
  • scattering cross section

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