1. Advanced
Composites Centre for Innovation and Science (ACCIS), University of Bristol, BS8 1TR Bristol, United Kingdom
2. Metamaterials
Unit, University of Malta, Msida MSD 2080, Malta
3. Materials
Science and Engineering, Georgia Institute of Technology, 801 Ferst
Drive North West, Atlanta, Georgia 30332-029, United States
4. H
H Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TS, United Kingdom