1. School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
2. Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 USA
3. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
4. Institute for Soldier Nanotechnology Massachusetts Institute of Technology Cambridge MA 02139 USA
5. Department of Intelligent Systems Engineering Indiana University Bloomington Bloomington IN 47408‐2664 USA
6. CREOL The College of Optics & Photonics University of Central Florida Orlando FL 32816 USA
7. Department of Physics Massachusetts Institute of Technology Cambridge MA 02139 USA
8. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology MA 02139 USA