作者机构:[1]Yibin Vocational and Technical College, Yibin 644003, China, [2]School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant Nos. 11174117 and 11374132) and the Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province, China.