1. Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
2. School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
3. Institute of Solid State Physics, Abbe Center of Photonics, Friedrich Schiller University, Helmholtzweg 3, 07743 Jena, Germany
4. Institute of Applied Physics, Abbe Centre of Photonics, Friedrich Schiller University, Albert-Einstein-Str. 15, 07745 Jena, Germany
5. Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76297 Eggenstein-Leopoldshafen, Germany