1. Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
2. University of Applied Sciences Emden/Leer, 26723 Emden, Germany
3. Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07743 Jena, Germany
4. Fraunhofer-Institute for Applied Optics and Precision Engineering IOF, 07743 Jena, Germany
5. Max-Planck-School of Photonics, 07743 Jena, Germany
6. Materials Science and Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287, United States
7. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
8. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
9. Depto. de Física de Materiales, Instituto Nicolás Cabrera, Instituto de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain