1. Department of Electrical and Computer Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801
2. Nick Holonyak Micro and Nanotechnology Laboratory, University of Illinois Urbana-Champaign, Urbana, IL 61801
3. Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL 61801
4. Department of Bioengineering, University of Illinois Urbana-Champaign, Urbana, IL 61801
5. Carl R. Woese Institute of Genomic Biology, University of Illinois Urbana-Champaign, Urbana, IL 61801