posted on 2021-07-16, 15:05authored byFranziska Muckel, Kathryn N. Guye, Shaun M. Gallagher, Yun Liu, David S. Ginger
As
easy-to-grow quantum wells with narrow excitonic features at
room temperature, two-dimensional (2D) Ruddleson–Popper perovskites
are promising for realizing novel nanophotonic devices based on exciton–photon
interactions. Here, we demonstrate a distinct hybrid exciton–photon
Fano resonance in (C4H9NH3)2PbI4 thin films prepared via spin coating. Using a classical
coupled-oscillator model and finite-difference time-domain simulations,
we link the Fano interference to the coupling of the exciton with
the Rayleigh-like scattering of the film microstructure. Combining
colloidal plasmonic cavities with the 2D perovskite films, we demonstrate
tuning of the Fano resonance. In combination with silver nanoparticles,
the exciton–photon Fano interference couples to the in-plane
plasmonic modes with indications of Rabi splitting. By creating a
nanoparticle on mirror geometry, we address the out-of-plane excitonic
component, reaching an intermediate coupling regime. These structures
suggest possible photonic targets for biomolecular self-assembly applications.