1. Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
2. Nick Holonyak Jr. Micro and Nanotechnology Laboratory, Urbana, IL 61801, USA
3. Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
4. Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
5. Carl R. Woese Institute for Genomic Biology, Urbana, IL 61801, USA
6. Cancer Center at Illinois, Urbana, IL 61801, USA