1. Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education and International R & D Center of Micro-Nano Systems and New Materials Technology, Chongqing University, Chongqing 400044, China
2. IHP - Innovations for High Performance Microelectronics, Leibniz Association, Frankfurt (Oder) 15236, Germany
3. Chongqing Acoustic-Optic-Electric Co. Ltd., China Electronic Technology Group Corp., Chongqing 400060, China