1. Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210, USA.
2. Department of Physics, The Ohio State University, Columbus, OH 43210, USA.
3. Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA.
4. Interdisciplinary Biophysics Graduate Program, The Ohio State University, Columbus, OH 43210, USA.
5. Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.