1. Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
2. Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
3. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
4. Bioimaging Science and Technology Group, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
5. College of Applied Health Science, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA
6. Medical Imaging Research Laboratory, Department of Speech and Hearing Science, University of Jllinois at Urbana-Champaign, Urbana, IL 61801, USA
7. International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan