Quantum-dot nano-cavity lasers with Purcell-enhanced stimulated emission

• Published in: Applied physics letters Vol. 100; no. 13; pp. 131107 - 131107-4
• Main Authors: Gregersen, N., Suhr, T., Lorke, M., Mørk, J.
• Format: Journal Article
• Language: English
• Published: American Institute of Physics 26-03-2012
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.3697702

We present a rate equation model for quantum-dot light-emitting devices that take into account Purcell enhancement of both spontaneous emission and stimulated emission as well as the spectral profile of the optical and electronic density-of-states. We find that below threshold the
β
-factor in a quantum-dot nanolaser depends strongly on the pump. For quantum dots with linewidth comparable to that of the cavity, we then show that an otherwise non-lasing device can lase due to Purcell enhancement of the stimulated emission. Finally, we compare the rate equation model to a microscopic model and obtain good agreement.