About the Authors

Mai Lu

mai.lu@hotmail.com

Affiliation Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu Province, P. R. China

Shoogo Ueno

Affiliation Department of Applied Quantum Physics, Graduate School of Engineering, Kyushu University, Fukuoka 812-8581, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: ML SU. Data curation: ML. Formal analysis: ML SU. Funding acquisition: ML. Investigation: ML SU. Methodology: ML SU. Project administration: ML. Resources: ML. Software: ML. Supervision: ML. Validation: ML. Visualization: ML. Writing – original draft: ML. Writing – review & editing: ML SU.