1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique; School of Electronic and Information Engineering; Xi'an Jiaotong University; Xi'an 710049 China
2. Department of Materials Science and Engineering; University of Washington; Seattle WA 98195 USA
3. Collaborative Innovation Center of Extreme Optics; Shanxi University; Taiyuan 030006 China
4. Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineer; Jilin University; Changchun 130012 China
5. Department of Physics & Materials Science; City University of Hong Kong; Kowloon 999077 Hong Kong