1. Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2600, Australia
2. Council of Scientific & Industrial Research – Central Electronics Engineering Research Institute, Pilani, Rajasthan 333031, India
3. Centre for Advanced Microscopy, The Australian National University, Canberra, Australian Capital Territory 2600, Australia
4. Australian National Fabrication Facility ACT Node, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2600, Australia
5. Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2600, Australia