1. School of Aerospace Engineering and Applied Mechanics, Tongji University, 200092 Shanghai, China
2. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, 200092 Shanghai, China
3. Department of Mathematics and Physics, Institute of Photonics, Leibniz University Hannover, Hannover, Germany
4. Département de Physique, Institut d'Electronique, de Microélectonique et de Nanotechnologie, UMR CNRS 8520, Université de Lille, 59650 Villeneuve d'Ascq, France