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

TL;DR

This paper demonstrates that dielectric BIC metasurfaces can significantly enhance superradiant emission from molecular J-aggregates at room temperature, enabling large-scale cooperative exciton-polariton behavior.

Contribution

It introduces a novel platform using silicon BIC metasurfaces to achieve highly collective superradiant emission from J-aggregates at room temperature, surpassing previous subwavelength limitations.

Findings

Enhanced emission rate and intensity due to strong coupling with photonic modes.

Observation of super-bunched photon emission with g^(2)(0)>13.

Spatial coherence extends over 6.7 micrometers, indicating large cooperative domains.

Abstract

Highly correlated photon sources can be realized through cooperative coupling among quantum systems, giving rise to superradiant collective emission. In solid-state ensembles, however, such collective behaviour is confined to subwavelength dimensions and is strongly suppressed at room temperature by inhomogeneous broadening and rapid dephasing, limiting practical implementations. Here, we show that molecular J-aggregates sustain room temperature superradiant emission and enter a highly collective regime when strongly coupled to delocalized photonic modes of a silicon bound-state-in-the-continuum (BIC) metasurface, extending J-exciton interactions far beyond the subwavelength limit. This enhanced cooperativity produces a photonic-fraction-dependent increase in emission rate and intensity and drives the system into a highly superbunched photon emission regime with g^((2))(0)>13. Spatial coherence measurements and stochastic modelling reveal that metasurface-mediated synchronization of ~10^3 J-excitons occurs within coupled superradiant domains spanning up to 6.7 um in diameter, corresponding to a 50-fold increase in inter-aggregate cooperative distance. These results establish exciton-polaritons in resonant dielectric metasurfaces as a platform to enhance superradiant emission and engineer temporally correlated light sources with picosecond-scale emission dynamics operating at room temperature.