Observation of optical anisotropy of highly uniform InAs quantum dots

• Published in: Journal of crystal growth Vol. 378; pp. 463 - 465
• Main Authors: Uemura, M., Ohta, J., Yamaguchi, R., Yamaguchi, K., Tackeuchi, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2013; Elsevier
• Subjects: A1. Nanostructures; A3. Molecular beam epitaxy; Anisotropy; B2. Semiconducting III–V materials; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Evolution; Exact sciences and technology; Excitation; Excitation spectra; Ground state; Indium arsenides; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Molecular, atomic, ion, and chemical beam epitaxy; Nanoscale materials and structures: fabrication and characterization; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other topics in nanoscale materials and structures; Photoluminescence; Physics; Quantum dots; A3. Molecular beam epitaxy; B2. Semiconducting III–V materials; A1. Nanostructures; B2. Semiconducting III―V materials; Energy levels; Ground states; Quantum dots; Photoluminescence; Nanostructures; Excited states; Indium arsenides; III-V compound; Optical anisotropy; Molecular beam epitaxy; Nanostructured materials; III-V semiconductors
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2012.12.102

We have investigated the optical anisotropy of single-layer highly uniform InAs quantum dots (QDs) by photoluminescence (PL) measurements. The high uniformity of the QDs, whose PL spectrum was clearly separated into each energy level, enabled us to observe the optical anisotropy of the ground state, the first excited state and the second excited state separately. The degree of linear polarization (DLP) was obtained to be 15.8%, 14.3% and 8.3% for the ground state, the first excited state and the second excited state, respectively. This result shows that the DLP is smaller for higher-energy states. We also measured the time evolutions of the PL polarization components using a streak camera. The DLP was found to remain constant during the measured time range. ► Optical anisotropy of highly uniform InAs quantum dots (QDs) has been investigated. ► Highly uniform QDs enabled us to observe the optical anisotropy of each energy level. ► The degree of linear polarization (DLP) becomes smaller for higher-energy states. ► We also measured the time evolutions of the DLP. ► The DLP was found to remain constant during the measured time range.