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Optical properties of dielectric nanoparticle assemblies: Dual particles and strongly interacting dimers

AuthorsAizpurua, Javier
Issue Date2015
PublisherAmerican Chemical Society
AbstractThe polarization of the light scattered by dielectric nanoparticles shows peculiar properties when the scatterers exhibit strong electric and magnetic polarizabilities. While the distribution of the scattering intensity in these systems shows the typical irregular speckle patterns, the helicity of the incident light can be fully conserved when the electric and magnetic polarizabilities of the scatterers are equal. We show that the multiple scattering of helical beams by a random dispersion of >dual'' dipolar nano-spheres leads to a speckle pattern exhibiting a perfect isotropic constant polarization, a situation that could be useful in coherent control of light as well as in lasing in random media. Furthermore, we also study the hybridization of electric and magnetic dipolar modes of submicron dielectric nanoparticles, assembled into a dimer structure, with an optical response in the visible regime. We investigate the effect of substrate, shape, and oxidation of the particles in the hybridization process leading to modifications of the optical response. The results found are corroborated by polarization-resolved dark field microscopy measurements.
DescriptionResumen del trabajo presentado a la International Conference on Materials for Advanced Technologies, celebrada en Singapur del 28 de junio al 3 de julio de 2015.
Appears in Collections:(CFM) Comunicaciones congresos
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