1. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
2. Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
3. Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
4. Department of Metallurgical and Materials Engineering, Karamanoglu Mehmetbey University, 70100 Karaman, Turkey
5. Institute for Energy and Material/Food Resources, Technology Innovation Division, Panasonic Corporation, 3-1-1 Yagumo-Naka-machi, Moriguchi
City, Osaka 570-8501, Japan