Chiral electroluminescence from thin-film perovskite metacavities

Abstract

Chiral light sources realized in ultracompact device platforms are highly desirable for various applications. Among active media used for thin-film emission devices, lead-halide perovskites have been extensively studied for photoluminescence due to their exceptional properties. However, up to date, there have been no demonstrations of chiral electroluminescence with a substantial degree of circular polarization (DCP) based on perovskite materials, being critical for the development of practical devices. Here, we propose a concept of chiral light sources based on a thin-film perovskite metacavity and experimentally demonstrate chiral electroluminescence with a peak DCP approaching 0.38. We design a metacavity created by a metal and a dielectric metasurface supporting photonic eigenstates with a close-to-maximum chiral response. Chiral cavity modes facilitate asymmetric electroluminescence of pairs of left and right circularly polarized waves propagating in the opposite oblique directions. The proposed ultracompact light sources are especially advantageous for many applications requiring chiral light beams of both helicities.

Nonlinear chiral metaphotonics: a perspective

“…Recently, a particular example of such a metacavity based on an aluminum mirror and a metasurface consisting of a square lattice of silicon triangular prisms was used to realize chiral electroluminescence from a plain perovskite layer. 104 Finally, we wish to mention the emerging field of nonlinear topological photonics, which merges the physics of topological phases with nonlinear optics. 105 In topological systems, topological protection in the linear regime is associated with the topological edge states that occur in counterpropagating pairs with opposite spin.…”

Nearly Perfect Routing of Chiral Light by Plasmonic Grating on Slab Waveguide

“…In particular, selectivity by the light handedness was demonstrated for scattering by individual nanoparticles, [51] directional emission in metamaterials, [52] photonic crystal modes routing, [53] directional Raman scattering, [54] handedness-controlled waveguide splitters. [55,56] Similar structures and ideas are implemented for realization of chiral mirrors, [57] metasurfaces [58,59] and resonators [60][61][62][63] that also interact differently with light depending on its handedness.…”