1. Center
for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Hangzhou 310018, China
2. State
Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
3. Ministry of Education & Zhejiang Province, Key Laboratory of E&M, Zhejiang University of Technology, Hangzhou 310014, China
4. Tianjin
Key Laboratory of Modern Engineering Mechanics, Department of Mechanics, Tianjin University, Tianjin 300072, China