Chiral electroluminescence from thin-film perovskite metacavities

TL;DR

This paper introduces a novel thin-film perovskite metacavity that produces chiral electroluminescence with significant circular polarization, advancing ultracompact chiral light sources for various technological applications.

Contribution

It demonstrates the first experimental realization of chiral electroluminescence in perovskite-based devices using a specially designed metacavity with high circular polarization.

Findings

Achieved DCP approaching 0.38 in electroluminescence

Designed a metacavity supporting chiral photonic eigenstates

Facilitated asymmetric emission of circularly polarized light

Abstract

Chiral light sources realized in ultracompact device platforms are highly desirable for various applications. Among active media employed 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), being critical for the development of practical devices. Here, we propose a new concept of chiral light sources based on a thin-film perovskite metacavity and experimentally demonstrate chiral electroluminescence with DCP approaching 0.38. We design a metacavity created by a metal and a dielectric metasurface supporting photonic eigenstates with 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.