Exciton polaritons—hybrid exciton-photon quasi-particles—provide an exciting platform to design new optoelectronic functionalities. Here we report a novel optical system by integrating Sn based 2D perovskites with high-quality plasmonic nanoparticle arrays, which support the hybridization between exciton and surface lattice resonance (SLR) with a coupling strength as large as 180 meV. Rapid energy transfer between exciton reservoir and hybrid states is characterized with transient absorption spectroscopy. We directly visualize polariton enhanced exciton transport via transient absorption microscope with ~300 fs temporal resolution and ~50 nm spatial precision, and evidenced different extent of enhancement when varying collection angle. The observed kinetic and transport behavior can be well described by a reservoir-polariton energy exchange model, resulting in a polariton speed orders of magnitude larger than that of the exciton. With the flexibility of tuning both plasmonic modes and exciton resonances, this hybrid platform can be expanded to a wide range of energies, with potentials for applications ranging from solar cells to quantum information.

Enhance exciton transport via light-matter coupling in 2D perovskites

ACS Spring 2022

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