Dear Colleagues,

Rapid progress in the field of photonics causes increased interest in dielectric metamaterials, which, unlike conventional metamaterials, composed of metallic cut wires and split-ring resonators, could be made practically lossless at frequencies up to those of optics. The first designs of dielectric metamaterials were based on the same approaches as those used for conventional metamaterials, i.e., employing complementary resonators providing magnetic- and electric-type resonances in respective elements. Later, dielectric metamaterials composed of identical resonators started to attract more attention due to the availability of technological methods for their fabrication, including nanotechnology. The interest in such dielectric metamaterials has notably increased after observation of negative refraction in these arrays, which was often considered to be related to the overlapping of electric and magnetic Mie resonances and, respectively, to double negativity of the effective medium parameters. However, metamaterials composed of identical dielectric resonators are also expected to have common features with photonic crystals, even if their resonators are small compared to their wavelengths. While the interest to these low-loss media, providing for negative refraction, is growing, and the areas of their application are increasing, questions about the nature of their electromagnetic responses remain. What are the roles of periodicity and resonances in particles and how does their interplay affect the properties of the structures? Can refraction in dielectric metametarials be controlled by their dispersive properties instead of Mie resonances?

The aim of this Special Issue is to attract leading researchers to the discussion of the complexity of underlying physics in dielectric metamaterials and to clarify the nature of their electromagnetic responses, to report the latest achievements in their fabrication and design, and to highlight their exciting properties and new applications.

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• Dielectric metamaterials
• Photonic crystals
• Mie resonances
• Lorentz’s dispersion
• Homogenization theory
• Effective parameters
• Coupling between resonators
• Dispersion diagrams
• Extraction of index values  
• Negative refraction