Funding for this research was provided by:
National Natural Science Foundation of China (61674110, 91121021, 61674022)
Article History
Received: 5 February 2018
Accepted: 5 April 2018
First Online: 18 April 2018
Authors’ Information
: XFW is a professor in the College of Physics, Optoelectronics and Energy, Soochow University. He obtained his BSc degree in 1989 from Shanghai Jiaotong University and earned his PhD degree in 1994 at Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science. YSL is a professor in the College of Physics and Engineering, Changshu Institute of Technology.
: The authors declare that they have no competing interests.
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