Enhanced cooperativity of J-exciton-polaritons in dielectric BIC metasurfaces

Abstract: Sources of highly correlated photons are critical for non-linear optics, emerging quantum information, communication and sensing technologies, as well as for fundamental studies of light-matter interaction. A strategy to realize such sources relies on the cooperative coupling of quantum emitters, enabling collective light emission known as superradiance. Here, we demonstrate that organic molecular J-aggregates exhibit room temperature superradiant emission that transitions to a highly collective regime of ~250 synchronized J-excitons when strongly coupled to delocalized photonic modes of a silicon bound-state-in-the-continuum metasurface. This enhanced cooperativity manifests as a Rabi splitting dependent scaling of both emission rate and intensity, driving the system into a superbunching regime of photon statistics. At the highest excitation density, we observe massively superbunched photon emission with g2(0)>13, unlocking new possibilities for engineering ultrafast, temporally correlated light sources that can operate at room temperature.