Strong exciton−photon coupling with colloidal quantum dots in a tunable microcavity

Polariton emission from optical cavities integrated with various luminophores has been extensively studied recently due to the wide variety of possible applications in photonics, particularly promising terms fabrication low-threshold sources coherent emission. Tuneable microcavities allow extensive investigation photophysical properties matter placed inside cavity by deterministically changing coupling strength and controllable switching weak strong ultra-strong regimes. Here we demonstrate room temperature exciton transitions CdSe/ZnS/CdS/ZnS colloidal quantum dots modes a tuneable low-mode-volume microcavity. Strong is evidenced large Rabi splitting photoluminescence spectra depending on detuning A 154 meV achieved. High yields, excellent photostability, scalability QDs paves way practical coupled systems based optoelectronics, sensing.