1. Laboratory of Micro-Nano Optics, College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, P. R. China
2. Southwest Institute of Technical Physics, Chengdu, 610054, P. R. China
3. Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Jiujiang Research Institute, Xiamen University, Xiamen, 361005, P. R. China