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Updated: Jun 2, 2026
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Spontaneous emission study on 1.3 µm InAs/InGaAs/GaAs quantum dot lasers
C Y Liu1, M Stubenrauch, D Bimberg
1Technische Universität Berlin, Institut für Festkörperphysik, Sekretariat EW 5-2, Berlin, Germany. liucy@sol.physik.tu-berlin.de
Nanotechnology
|April 15, 2011
Summary
True spontaneous emission in quantum dot (QD) lasers reveals Auger processes dominate nonradiative recombination for ground and excited states. Cavity length significantly impacts these processes due to gain saturation.
Area of Science:
- Semiconductor Physics
- Optoelectronics
- Quantum Dot Technology
Background:
- Quantum dot (QD) lasers are crucial for optoelectronic devices.
- Understanding nonradiative recombination (NR) is key to improving laser efficiency.
- True spontaneous emission (TSE) provides insights into carrier dynamics.
Purpose of the Study:
- To investigate nonradiative recombination processes in InAs/InGaAs/GaAs QD lasers.
- To analyze the influence of injection current and cavity length on TSE.
- To explore carrier competition between ground state (GS) and excited state (ES) transitions.
Main Methods:
- Performed True Spontaneous Emission (TSE) measurements.
- Analyzed TSE as a function of injection current and cavity length.
- Investigated both ground state (GS) and excited state (ES) transitions.
Main Results:
- Auger processes identified as major NR mechanisms for both GS and ES transitions.
- Experimentally demonstrated Auger-like NR features in ES transitions for the first time.
- Observed carrier competition between ES and GS transitions.
- Found cavity length significantly affects GS NR due to gain saturation.
Conclusions:
- Auger processes are critical for NR in QD lasers.
- ES transitions exhibit Auger-like NR behavior.
- Carrier dynamics are influenced by competition between states.
- Cavity length and gain saturation must be considered in NR analysis for QD lasers.
