Tunable multiple Fano resonances in magnetic single-layered core-shell particles

Autor(es)

Arruda, Tiago J. ^[1] ; Martinez, Alexandre S. ^{[1, 2]} ; Pinheiro, Felipe A. ^{[3, 4, 5]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Sao Paulo - Brazil

^[2] Natl Inst Sci & Technol Complex Syst, BR-22290180 Rio De Janeiro - Brazil

^[3] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro - Brazil

^[4] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants - England

^[5] Univ Southampton, Ctr Photon Metamat, Southampton SO17 1BJ, Hants - England

• Tipo de documento: Artigo Científico
• Fonte: Physical Review A; v. 92, n. 2 AUG 19 2015.
• Citações Web of Science: 10

Resumo

We investigate multiple Fano, comblike scattering resonances in single-layered, concentric core-shell nanoparticles composed of magnetic materials. Using the Lorenz-Mie theory, we derive, in the long-wavelength limit, an analytical condition for the occurrence of comblike resonances in the single scattering by coated spheres. This condition establishes that comblike scattering response uniquely depends on material parameters and thickness of the shell, provided that it is magnetic and thin compared to the scatterer radius. We also demonstrate that comblike scattering response shows up beyond the long-wavelength limit and it is robust against absorption. Since multiple Fano resonances are shown to depend explicitly on the magnetic permeability of the shell, we argue that both the position and profile of the comblike, morphology-dependent resonances could be externally tuned by exploiting the properties of engineered magnetic materials. (AU)

• Processo FAPESP: 10/10052-0 - Energia interna e espalhamento de ondas eletromagnéticas por esferas ou cilindros: ressonâncias de Fano e suas aplicações a metamateriais
• Beneficiário: Tiago José Arruda
• Modalidade de apoio: Bolsas no Brasil - Doutorado