1. Department of Electronic Materials Engineering Research School of Physics The Australian National University Canberra ACT 2601 Australia
2. Australian National Fabrication Facility ACT Node Research School of Physics The Australian National University Canberra ACT 2601 Australia
3. Centre for Advanced Microscopy The Australian National University Canberra ACT 2601 Australia
4. Microstructural Analysis Unit University of Technology Sydney Sydney NSW 2007 Australia
5. School of Engineering The Australian National University Canberra ACT 2601 Australia
6. Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems Research School of Physics The Australian National University Canberra ACT 2601 Australia