Engineering a Light–Matter Strong Coupling Regime in Perovskite-Based Plasmonic Metasurface: Quasi-bound State in the Continuum and Exceptional Points

05 Apr 2021

Abstract

We present theoretically the formation of exciton–photon polaritons and exciton-surface plasmon polaritons in a
perovskite-based subwavelength lattice on the metallic plane. It is shown that the later polaritons will be achieved
as the perovskite layer is ultra-thin (<50 nm), while the co-existence of both polaritons will dominate, as the
thickness of the perovskite metasurface approaches wavelength-scale. In the two cases, the lower polaritonic
branches consist of dark and bright modes corresponding to infinite and finite radiative quality factors, respectively. Another salient property in this work is that it allows one to obtain exceptional points (EPs) in momentum
space with a four-fold enhancement of local density of states through engineering the perovskite metasurface. Our
findings show that the perovskite metasurface is an attractive and rich platform to make polaritonic devices, even
with the presence of a lossy metallic layer.

Authors: Le Van, Q. and other authors

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