Thresholdless transition to coherent emission at telecom wavelengths from coaxial nanolasers

Abstract

The ongoing miniaturization of semiconductor lasers has enabled ultra-low threshold devices and even provided a path to approach thresholdless lasing with linear input-output characteristics. Such nanoscale lasers have initiated a discourse on the origin of the physical mechanisms involved and their boundaries, such as the required photon number, the importance of optimized light confinement in a resonator and mode-density enhancement. Here, we investigate high-$\beta$ metal-clad coaxial nanolasers, which facilitate thresholdless lasing. We experimentally and theoretically investigate both the conventional lasing characteristics, as well as the photon statistics of the emitted light. While the former lacks adequate information to determine the threshold to coherent radiation, the latter reveals a finite threshold pump power. Our work clearly highlights an important and often misunderstood aspect of high-$\beta$ lasers, namely that a thresholdless laser does have a finite threshold pump power and must not be confused with a hypothetical zero threshold laser.

arXiv comment7 pages, 4 figures

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• "Phase Transitions" in small systems: why standard threshold definitions fail for nanolasers
• Photon statistics and dynamics of nanolasers subject to intensity feedback
• Revisiting the Siegert relation for the partially coherent regime of nanolasers
• Lasing of Quantum-Dot Micropillar Lasers under Elevated Temperatures
• Population fluctuation mechanism of the super-thermal photon statistic of LEDs with collective effects
• Modeling Quantum Noise in Nanolasers using Markov Chains