1. Chair in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
2. Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
3. MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, Macquarie Park, New South Wales 2109, Australia
4. School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
5. Department of Phyiscs, Imperial College London, London SW7 2AZ, United Kingdom