Optically pumped rolled-up InGaAs/GaAs quantum dot microtube lasers
2009; Optica Publishing Group; Volume: 17; Issue: 22 Linguagem: Inglês
10.1364/oe.17.019933
ISSN1094-4087
Autores Tópico(s)Photonic and Optical Devices
ResumoThe authors report on the achievement of lasing in rolled-up semiconductor microtubes at room temperature, wherein self-organized InGaAs/GaAs quantum dots are incorporated as the gain medium. The free-standing quantum dot microtubes, with a diameter of approximately 5-6 microm and wall thickness of approximately 100 nm, are formed when the coherently strained InGaAs/GaAs quantum dot heterostructure is selectively released from the GaAs substrate. The devices are characterized by an ultralow threshold (approximately 4 microW) and a minimum intrinsic linewidth of approximately 0.2 - 0.3 nm at room temperature. The multiple lasing modes are analyzed using both the finite-difference time domain method and also a planar dielectric waveguide model.
Referência(s)