1. Physics and Chemistry of Nanostructures group, Department of Chemistry, Ghent University, Gent 9000, Belgium
2. NOLIMITS, Core Facility for Non-Linear Microscopy and Spectroscopy, Ghent University, Gent, 9000, Belgium
3. The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand
4. The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin 9016, New Zealand
5. Robinson Research Institute, Faculty of Engineering, Victoria University of Wellington, Wellington 6012, New Zealand
6. School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand