Perovskite crystals, with their exceptional nonlinear optical properties, lasing and waveguiding capabilities, could offer a promising platform for integrated photonic circuitry within the strong-coupling regime at room temperature.
Researchers at the University of Warsaw, CNR Nanotec, Łukasiewicz Research Network—Institute of Microelectronics and Photonics, Łódź University of Technology and Polish Academy of Sciences have demonstrated a versatile template-assisted method to efficiently fabricate large-scale waveguiding perovskite crystals of arbitrarily predefined geometry such as microwires, couplers and splitters.
The team non-resonantly stimulated a condensate of waveguided exciton–polaritons resulting in bright polariton lasing from the transverse interfaces and corners of the perovskite microstructures.
Large blueshifts with excitation power and high mutual coherence between the different edge and corner lasing signals were detected in the far-field photoluminescence, implying that a spatially extended condensates of coherent polaritons has formed.
The condensate polaritons were found to propagate over long distances in the wires from the excitation spot and can couple to neighboring wires through large air gaps, making the novel platform promising for integrated polaritonic circuitry and on-chip optical devices with strong nonlinearities.
