Artificial magnetism and negative refractive index in three-dimensional metamaterials of spherical particles at near-infrared and visible frequencies
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In this paper, we present a new class of 3D metamaterials that exhibit artificial magnetism and/or negative refractive index. These metamaterials consist of spherical particles made from strongly resonant materials such as ionic/semiconductor materials and noble metals. Their electromagnetic response is studied using the extended Maxwell–Garnett effective medium theory and an ab initio method based on multiple scattering theory. The agreement between both treatments is very good, rendering the effective medium approximation a useful guide for the experimentalist in the field.
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