1. Institute of Electromagnetics and Acoustics
2. and Fujian Provincial Key Laboratory of Electromagnetic Wave Science and Detection Technology
3. Xiamen University
4. Xiamen 361005
5. China
6. Optoelectronics Research Centre and Centre for Photonic Metamaterials
7. University of Southampton
8. Southampton
9. UK
10. Department of Electrical and Computer Engineering
11. Duke University
12. Durham
13. USA