1. Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, Henan Normal University, Xinxiang 453007, P. R. China
2. School of Physics, Hefei University of Technology, Anhui 230009, P. R. China
3. School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, P. R. China
4. Shandong Institute of Advanced Technology, Jinan 250100, Shandong, P. R. China