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. Shaanxi Coal Chemical Industry Technology Research Institute Co., Ltd., Xi’an 710065, China
3. School of Electronic Engineering, Xi’an University of Posts & Telecommunication, Xi’an 710121, China