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Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties
摘要： Rigorous superposition T-matrix method is used to compute light interaction with mesocrystalline structures. The results are used to validate the applicability of effective medium theories for computing the effective optical constants of mesocrystal structures composed of optically isotropic materials. It is demonstrated that the Maxwell-Garnett theory can fit the rigorous simulation results with an average accuracy of 2%. The thus obtained refractive indexes can be used with any electromagnetic simulation software to represent the response of mesocrystals composed of optically small primary particles arranged into a cubic type lattice structures.
关键词： Mie scattering,numerical modelling,particles,mesocrystals,T-matrix,Maxwell-Garnett,light scattering,effective medium theory
更新于2025-09-04 15:30:14
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Pole-zero analysis of scattering resonances of multilayered nanospheres
摘要： We demonstrate a general pole-zero method for the design of the scattering resonances of multilayered nanospheres, and we apply it to the relevant cases of strongly dispersive light scattering from metal-dielectric-metal and all-dielectric nanostructures. The pole-zero method is based on the full-wave iterative solution of the Mie scattering theory of multilayered spheres, which is valid beyond the conventional quasistatic limit. By investigating scattering resonances in the complex frequency plane, we show how to engineer anomalous Fano-like dipolar line shapes from complex pole-zero interactions controlled by the geometrical parameters of the structures. The pole-zero method is then applied to the design of the backscattering and forward-scattering efficiencies beyond the dipolar approximation. The engineering of scattering and absorption resonances with customized line shapes in metal-dielectric nanostructures provides unique opportunities for active devices including optical sensors, light emitters, and nonlinear elements.
关键词： multilayered nanospheres,Fano-like resonances,scattering resonances,Mie scattering theory,pole-zero method
更新于2025-09-04 15:30:14