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

TL;DR

This paper demonstrates the experimental realization of high-Q resonances and directional lasing in dielectric nanoresonator arrays in the visible spectrum, enabling advanced flat photonics applications.

Contribution

It introduces a novel approach to achieve high-Q resonances and multi-mode directional lasing using dielectric nanoresonator arrays with BICs in the visible regime.

Findings

High-Q resonances achieved in visible spectrum via collective dipole coupling

Room temperature lasing with high directionality and low threshold

Demonstration of multi-mode, directional lasing modes

Abstract

The strong electric and magnetic resonances in dielectric subwavelength structures have enabled unique opportunities for efficient manipulation of light-matter interactions. Besides, the dramatic enhancement of nonlinear light-matter interactions near so-called bound states in the continuum (BICs) has recently attracted enormous attention due to potential advancements in all-optical and quantum computing. However, the experimental realizations and the applications of high- Q factor resonances in dielectric resonances in the visible regime have thus far been considerably limited. In this work, we explore the interplay of electric and magnetic dipoles in arrays of dielectric nanoresonators to enhance light-matter interaction. We report on the experimental realization of high-Q factor resonances in the visible through the collective diffractive coupling of electric and magnetic dipoles. Providing direct physical insights, we also show that coupling the Rayleigh anomaly of the array with the electric and magnetic dipoles of the individual nanoresonators can result in the formation of different types of BICs. We utilize the resonances in the visible regime to achieve lasing action at room temperature with high spatial directionality and low threshold. Finally, we experimentally demonstrate multi-mode, directional lasing and study the BIC-assisted lasing mode engineering in arrays of dielectric nanoresonators. We believe that our results enable a new range of applications in flat photonics through realizing on-chip controllable single and multi-wavelength micro-lasers.