1. Department of Applied Physics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China
2. Thin Film Centre, Scottish Universities Physics Alliance (SUPA), University of the West of Scotland, Paisley PA1 2BE, United Kingdom
3. Research Center of Laser Fusion, China Academy of Engineering Physics (CAEP), P.O. Box 919-988-5, Mianyang 621900, People's Republic of China
4. Institute for Integrated Micro and Nano Systems, Scottish Microelectronics Centre, School of Engineering, University of Edinburgh, Edinburgh EH9 3JF, United Kingdom
5. Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China