About the Authors

Wei-Lung Kao

Affiliation Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan, R.O.C.

Chia-Wei Sun

chiaweisun@nctu.edu.tw

Affiliation Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan, R.O.C.

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: C-WS. Performed the experiments: W-LK. Analyzed the data: W-LK. Contributed reagents/materials/analysis tools: W-LK. Wrote the paper: W-LK. Provided the original idea of the study and is a PI of the related project: C-WS. Provided the analysis method: C-WS. Calculated the experimental data: W-LK. Polished the paper: C-WS.