1. Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems Department of Electronic Materials Engineering Research School of Physics The Australian National University Canberra ACT 2601 Australia
2. Department of Electronic Materials Engineering Research School of Physics The Australian National University Canberra ACT 2601 Australia
3. Nanotechnology Research Laboratory Research School of Chemistry College of Science The Australian National University Canberra ACT 2601 Australia
4. Commonwealth Scientific and Industrial Research Organisation (CSIRO) Mineral Resources Private Bag 10, Clayton South Victoria 3169 Australia
5. Australian National Fabrication Facility The Australian National University Canberra ACT 2601 Australia
6. Nanotechnology Research Laboratory School of Biomedical Engineering, Faculty of Engineering The University of Sydney NSW 2006 Australia