1. College of Precision Instrument and Optoelectronics Engineering; Tianjin University; Key Laboratory of Optoelectronics Information and Technology (Ministry of Education); Tianjin 300072 China
2. School of Electrical and Computer Engineering Oklahoma State University; Stillwater OK 74078 USA
3. Multi-disciplinary Materials Research Center; Frontier Institute of Science and Technology; State Key Laboratory for Mechanical Behavior of Materials; School of Electronic and Information Engineering; Xi'an Jiaotong University; Xi'an 710049 China
4. Mechanics Department; School of Mechanical Engineering; Tianjin University; Tianjin 300072 China