Lecture "Recent Progress in All-Dielectric and Hybrid Optical Antennae and Metasurfaces"

Professor Pavel Belov is ​2017/2018 Sackler Lecturer of the Mortimer and Raymond Sackler Institute of Advanced Studies.

Abstract

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We suggest and verify experimentally a novel type of optical nanoantennas made of high-permittivity low-loss dielectric spheres. In addition to the electric resonances, they exhibit very strong magnetic resonances at the nanoscale. By placing a point-like dipole source near a single dielectric particle driven at the magnetic resonance results the radiation pattern similar to that of a Huygens source with the enhanced forward and vanishing backward emission. We also introduce a novel concept of superdirective nanoantennas based on the generation of higher order optically-induced magnetic multipoles. We present our recent results on femtosecond laser-assisted reconfiguration of all-dielectric and hybrid nanoantennae and metasurfaces. In particular, we propose a novel concept for ultrafast manipulation by scattering properties of an individual silicon nanoantenna with a magnetic dipole resonance by means of generation of electron-hole plasma.