1. Center for Bio/Molecular Science and Engineering, U.S. Naval Research Laboratory Code 6900, Washington, D.C. 20375, United States
2. Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
3. Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States
4. Optical Sciences Division, Code 5600, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
5. Electronics Science and Technology Division, Code 6800, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States