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The strong electric and magnetic resonances in dielectric subwavelengthstructures have enabled unique opportunities for efficient manipulation oflight-matter interactions. Besides, the dramatic enhancement of nonlinearlight-matter interactions near so-called bound states in the continuum (BICs)has recently attracted enormous attention due to potential advancements inall-optical and quantum computing. However, the experimental realizations andthe applications of high- Q factor resonances in dielectric resonances in thevisible regime have thus far been considerably limited. In this work, weexplore the interplay of electric and magnetic dipoles in arrays of dielectricnanoresonators to enhance light-matter interaction. We report on theexperimental realization of high-Q factor resonances in the visible through thecollective diffractive coupling of electric and magnetic dipoles. Providingdirect physical insights, we also show that coupling the Rayleigh anomaly ofthe array with the electric and magnetic dipoles of the individualnanoresonators can result in the formation of different types of BICs. Weutilize the resonances in the visible regime to achieve lasing action at roomtemperature with high spatial directionality and low threshold. Finally, weexperimentally demonstrate multi-mode, directional lasing and study theBIC-assisted lasing mode engineering in arrays of dielectric nanoresonators. Webelieve that our results enable a new range of applications in flat photonicsthrough realizing on-chip controllable single and multi-wavelengthmicro-lasers.

Single and multi-mode directional lasing from arrays of dielectric nanoresonators