1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and Engineering Xi'an Jiaotong University No. 28, Xianning West Road Xi'an 710049 China
2. Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research Xi'an Jiaotong University Xi'an 710049 China
3. Institute of Medical Engineering School of Basic Medical Sciences Health Science Center Xi'an Jiaotong University Xi'an 710061 China