1. College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China
2. Physics Department, Ningbo University, Ningbo 315211, Zhejiang, China
3. School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, Yunnan Province, China
4. State Environmental Protection Key Laboratory of Odor Pollution Control, Tianjin 300191, China
5. Department of Physics, University of Trieste, Trieste 34151, Italy
6. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China