1. School of Physics, Northwest University, Xi’an, 710069, China
2. Institute of Photonics & Photon-Technology, Northwest University, Xi’an, 710069, China
3. Institute of Modern Physics, Northwest University, Xi’an, 710069, China
4. Department of Mechanical Engineering, National University of Singapore, 117575, Singapore
5. Engineering Science, National University of Singapore, 117575, Singapore