About the Authors

Shree Hari Gautam

Affiliation Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America

Thanh T. Hoang

Affiliation Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America

Kylie McClanahan

Affiliation Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America

Stephen K. Grady

Affiliation Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America

Woodrow L. Shew

shew@uark.edu

Affiliation Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WLS SHG KM TTH SKG. Performed the experiments: WLS SHG KM TTH KLM. Analyzed the data: WLS TTH. Wrote the paper: WLS SHG.