1. National Center for International Research of Photoelectric Technology & Nano-Functional Materials and Application, Shaanxi Provincial Key Laboratory of Photoelectric Technology, Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710127, China
2. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China