1. Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-University Munich, 80539 Munich, Germany
2. Chair in Hybrid Nanosystems, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-University Munich, 80539 Munich, Germany
3. School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
4. Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
5. Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom