Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and Electronics Shandong Normal University Jinan 250358 China;
Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and Electronics Shandong Normal University Jinan 250358 China;
Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystems and Information Technology Chinese Academy of Sciences Shanghai 200050 China;
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China;
Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystems and Information Technology Chinese Academy of Sciences Shanghai 200050 China;
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China;
Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and Electronics Shandong Normal University Jinan 250358 China;