Optical response of dielectric&metal-core/metal-shell nanoparticles: Near electromagnetic field and resonance frequencies
Document title: Optical response of dielectric&metal-core/metal-shell nanoparticles: Near electromagnetic field and resonance frequencies
Journal: Revista mexicana de física
Database: PERIÓDICA
System number: 000460766
ISSN: 0035-001X
Authors: 1
1
1
1
Institutions: 1Universidad de Sonora, Departamento de Investigación en Física, Hermosillo, Sonora. México
2Universidad Popular del Cesar, Departamento de Física, Valledupar, Cesar. Colombia
Year:
Season: May-Jun
Volumen: 68
Number: 3
Country: México
Language: Inglés
Document type: Artículo
Approach: Analítico, teórico
English 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
Disciplines: Física y astronomía
Keyword: Optica,
Nanopartícula núcleo/cáscara,
Sección transversal de dispersión,
Límite cuasiestático,
Frecuencias de resonancia
Keyword: Optics,
Core/shell nanoparticle,
Scattering cross section,
Quasi-static limit,
Resonance frequencies
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