About the Authors

Bogdan Barz

Affiliation Physics Department, Drexel University, Philadelphia, Pennsylvania, United States of America

Brigita Urbanc

brigita@drexel.edu

Affiliation Physics Department, Drexel University, Philadelphia, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BU BB. Performed the experiments: BB. Analyzed the data: BB. Wrote the paper: BU.