Exciton Diffusion and Annihilation in Nanophotonic Purcell Landscapes

Abstract

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Manipulating the directional emission of monolayer semiconductors by dielectric nanoantenna arrays

“…In the far-field, the emission pattern of excitons of bare monolayers exhibits a Lambertian property, which displays a homogeneous distribution in the wave-vector space (figure 1(c)). The Lambertian pattern suggests the exciton herein as a model of in-plane point dipole at rest, disregarding the complexity of the diffusion of excitions [33]. For the excitons on the array, their emission light drives the periodic lattice of scatters in terms of collective Mie resonances underlying the NPAs.…”

Exciton Diffusion and Annihilation in Nanophotonic Purcell Landscapes

“…Excitonic emitters in semiconductors such as perovskites, transition metal dichalcogenides and organic crystals disperse through diffusion and interact through exciton-exciton annihilation. [1][2][3][4][5] Nanophotonic resonators can improve light emission by enhancing excitation and radiative rates, and beaming the emission. [6][7][8][9][10] The conventional Purcell effect treats emitters like molecules and quantum dots as immobile and non-interacting.…”