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Effective parameters and quasi-static resonances for periodic arrays of dielectric spheres

2010; Optica Publishing Group; Volume: 27; Issue: 3 Linguagem: Inglês

10.1364/josab.27.000488

1520-8540

Ruey-Lin Chern, Xingxiang Liu,

Electromagnetic Scattering and Analysis

We investigate the effective parameters and quasi-static resonances for periodic arrays of dielectric spheres. The effective medium model based on the homogenization of normal modes for spherical particles is used to determine the effective permittivity ϵeff and permeability μeff in the quasi-static regime. Major features of ϵeff and μeff are characterized by the Lorentz-type anomalous dispersion around the frequencies pertaining to the leading-order electric and magnetic resonances, respectively. In particular, the anomalous dispersion is depicted by a resonance function associated with the spherical cavity. The underlying mechanism of quasi-static resonance is illustrated with the localized and dipole-like field patterns at the resonant frequencies. A comparison with the effective parameters for periodic arrays of dielectric circular cylinders is also discussed.