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


  • Osnaider Rocha Rocha Universidad Popular del Cesar
  • S. Gastélum-Acuña CONACYT- Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Sonora, México
  • M. Flores-Acosta Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Sonora, México
  • R. García-Llamas Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Sonora, México




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


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.


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How to Cite

O. Rocha Rocha, S. . Gastélum-Acuña, M. Flores-Acosta, and R. . García-Llamas, “Optical response of dielectric&metal-core/metal-shell nanoparticles: Near electromagnetic field and resonance frequencies”, Rev. Mex. Fís., vol. 68, no. 3 May-Jun, pp. 031302 1–, May 2022.