About the Authors

Jay Samuel L. Combinido

Affiliation National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines

May T. Lim

may@nip.upd.edu.ph

Affiliation National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JSLC MTL. Performed the experiments: JSLC. Analyzed the data: JSLC MTL. Wrote the paper: JSLC MTL.