Abstract:Nanolasers based on emerging dielectric cavities with deep sub‐wavelength confinement of light offer a large light‐matter coupling rate and near‐unity spontaneous emission factor, . These features call for reconsidering the standard approach to identifying the lasing threshold. Here, a new threshold definition is suggested, taking into account the recycling process of photons when is large. This threshold reduces to the classical balance between gain and loss in the limit of macroscopic lasers, but qualitativ… Show more
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