Browsing by Author "Belov, P. A."
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Item All-dielectric metamirror for independent and asymmetric wave-front control(American Physical Society, 2019-11-25) Odit, M. A.; Sayanskiy, A. D.; Asadchy, Viktar; Kapitanova, P.; Tretyakov, S. A.; Belov, P. A.; ITMO University; Sergei Tretiakov Group; Department of Electronics and NanoengineeringWe report on the design and the numerical and experimental characterization of an all-dielectric reflecting focusing metasurface (metamirror) which does not have a back reflector, but effectively reflects incident waves with the desired reflection phase gradient. The profile of the reflection phase can be tuned independently for both sides of the single-layer subwavelength-thick metamirror by properly selecting dimensions of its dielectric inclusions. Such a feature stems from the bianisotropic omega properties of the inclusions. To demonstrate independent control of the reflection phase, we have designed a metamirror focusing normally incident plane waves at different focal distances being illuminated from the opposite sides. The proposed two-sided metamirror can find applications in antennas, diffraction gratings, and complex holograms. The absence of conducting elements makes it a perfect candidate for optical applications requiring asymmetric wave-front control.Item Superdirective all-dielectric nanoantennas: Theory and experiment(2014) Belov, P. A.; Krasnok, A. E.; Filonov, D. S.; Simovski, C. R.; Kivshar, Yu S.; Department of Radio Science and Engineering; Kostantin Simovski Group; St. Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO); Australian National UniversityWe introduce a novel concept of superdirective nanoantennas based on the generation of higherorder optically-induced magnetic multipoles. Such an all-dielectric nanoantenna can be realized as an optically small spherical dielectric nanoparticle with a notch excited by a point source located in the notch. We also confirm the predicted superdirectivity effect experimentally through scaling to the microwave frequency range.