Long-range self-hybridized exciton polaritons in two-dimensional Ruddlesden-Popper perovskites
arxiv(2024)
摘要
Lead halide perovskites have emerged as platforms for exciton-polaritonic
studies at room temperature thanks to their excellent photoluminescence
efficiency and synthetic versatility. In this work we find proof of strong
exciton-photon coupling in cavities formed by the layered crystals themselves,
a phenomenon known as self-hybridization effect. We use multi-layers of high
quality Ruddlesden-Popper perovskites in their 2D crystalline form, benefitting
from their quantum-well excitonic resonances and the strong Fabry-Perot cavity
modes resulting from the total-internal-reflection at their smooth surfaces.
Optical spectroscopy reveals bending of the cavity modes typical for
exciton-polariton formation, and photoluminescence spectroscopy shows thickness
dependent splitting of the excitonic resonance. Strikingly, local optical
excitation with energy below the excitonic resonance of the flakes in
photoluminescence measurements unveils coupling of light to in-plane
polaritonic modes with directed propagation. These exciton-polaritons exhibit
high coupling efficiencies and extremely low loss propagation mechanisms which
is confirmed by finite difference time domain simulations. We therefore prove
that mesoscopic 2D Ruddlesden-Popper perovskites flakes represent an effective
but simple system to study the rich physics of exciton-polaritons at room
temperature.
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