Beijing Institute of Technology, Beijing 100081, China

Beijing University of Posts and Telecommunications, Beijing 100876, China

¹ Optics Department, Shandong University, Jinan 250100, China

² Institute of Crystal Materials, Shandong University, Jinan 250100, China

State Key Laboratory of Precision Measurement Technology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China

Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

Department of Optoelectronic Engineering, HUST, Wushan Research Institute of Posts and Telecommunications, Vuhan 430074, China

Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Shanghai 201800, China

Department of Electronics Engineering, Tsinghua University, Beijing 100084, China

¹ State Key Laboratory on Integrated optoelectronics, Institute of Semiconductors, The Chinese Academy of Sciences, Beijing 100083, China

² Microelectronics center, Institute of Semiconductors, The Chinese Academy of Sciences, Beijing 100083, China

³ State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

¹ Institute of Optics and Photonics, Department of Applied Physics, Shanghai JiaoTong University, Shanghai 200030, China

² Instituto di Ricerca sulle Onde Electtromagnetiche del CNR, Via Panciatichi, 50127 Firenze, Italy

Department of Electronics & Information Technology, Shanxi Univ. Taiyuan 030006, China

Applied Optics Research Section, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China

Physics Department, Harbin Institute of Technology, Harbin 150001, China

¹ College of Science, Tianjin University, Tianjin 300072, China

² Department of Physics, Swansea University, U. K.

Department of Physics of University of Science and Technology of China, Hefei 230026, China