All-dielectric asymmetrical metasurfaces based on mesoscale dielectric particles with different optical transmissions in opposite directions through full internal reflection

摘要

Optically asymmetric metasurfaces are structures that pass light in one direction, but block it in another. This paper presents a numerical study of all-dielectric asymmetric metasurfaces based on a photonic nanojet effect from asymmetric dielectric particles, which have a full internal reflection in one direction. It has been shown that for conical dielectric particles, the formation of near-field localization near the shadow side of the particle depends on the direction of particle illumination. The criterion of critical cone angle for full internal reflection is described. The numerical simulations confirm the full internal reflection for the illumination of the conical particle from one side and the formation of the photonic jet from the other side. The asymmetric all-dielectric metastructure described in the paper can be used not only as an optical diode, but also as a transparent electrode and light-trapping structure for thin-film solar cells.