1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China
2. Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 Groningen AG 9747 The Netherlands
3. Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China
4. Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 P. R. China