1. Faculty of Engineering and Natural Sciences Tampere University P.O. Box 541 FI-33014 Tampere Finland
2. ARC Centre of Excellence in Exciton Science School of Science RMIT University Melbourne 3000 Australia
3. Department of Electronics Engineering Incheon National University Incheon 34958 South Korea
4. The Laboratory “Optics of Quantum Nanostructures” Center of Information Optical Technology ITMO University 49 Kronverksky Pr. St. Petersburg 197101 Russia