Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

• Published in: Nanotechnology Vol. 25; no. 3; p. 035204
• Main Authors: Muñoz-Matutano, G, Rivas, D, Ricchiuti, A L, Barrera, D, Fernández-Pousa, C R, Martínez-Pastor, J, Seravalli, L, Trevisi, G, Frigeri, P, Sales, S
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 24.01.2014; Institute of Physics
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electronics; Exact sciences and technology; excitons; fibre Bragg grating; Materials science; Molecular electronics, nanoelectronics; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Quantum dots; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; single quantum dot; time resolved spectroscopy; Quantum confinement; Gallium arsenides; Wetting; Quantum dots; Photoluminescence; Monochromators; Time resolved spectra; Indium arsenides; III-V compound; Biexcitons; Bragg gratings; Time resolution; Wettability; Excitons; Nanostructured materials; III-V semiconductors
• ISSN: 0957-4484; 1361-6528
• DOI: 10.1088/0957-4484/25/3/035204

Photoluminescence and time resolved photoluminescence from single metamorphic InAs/GaAs quantum dots (QDs) emitting at 1.3 μm have been measured by means of a novel fibre-based characterization set-up. We demonstrate that the use of a wavelength tunable fibre Bragg grating filter increases the light collection efficiency by more than one order of magnitude as compared to a conventional grating monochromator. We identified single charged exciton and neutral biexciton transitions in the framework of a random population model. The QD recombination dynamics under pulsed excitation can be understood under the weak quantum confinement potential limit and the interaction between carriers at the wetting layer and QD states.