1. Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, USA
2. Institute for Research in Electronics and Applied Physics (IREAP), University of Maryland, College Park, Maryland 20742, USA
3. Weinberg Medical Physics LLC, Bethesda, Maryland 20817, USA
4. Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
5. HGST Research Center, San Jose, California 95135, USA
6. Institute for Systems Research (ISR), University of Maryland, College Park, Maryland 20742, USA