Directional emission from electrically injected exciton–polaritons in perovskite metasurfaces

Wang, Yutao, Tian, Jingyi, Klein, Maciej, Adamo, Giorgio, Ha, Son Tung and Soci, Cesare (2023) Directional emission from electrically injected exciton–polaritons in perovskite metasurfaces. Nano Letters, 23 (10), 4431–4438. (doi:10.1021/acs.nanolett.3c00727).

Abstract

We present a new approach to achieving strong coupling between electrically injected excitons and photonic bound states in the continuum of a dielectric metasurface. Here a high-finesse metasurface cavity is monolithically patterned in the channel of a perovskite light-emitting transistor to induce a large Rabi splitting of ∼200 meV and more than 50-fold enhancement of the polaritonic emission compared to the intrinsic excitonic emission of the perovskite film. Moreover, the directionality of polaritonic electroluminescence can be dynamically tuned by varying the source-drain bias, which induces an asymmetric distribution of exciton population within the transistor channel. We argue that this approach provides a new platform to study strong light–matter interactions in dispersion engineered photonic cavities under electrical injection and paves the way to solution-processed electrically pumped polariton lasers.

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