1. Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
2. Department of Applied Physics, College of Physics, Chongqing University, Chongqing 401331, China
3. Biomedical Analysis Center, Army Medical University, Third Military Medical University, Chongqing 400038, China