1. Department of Electrical and Computer Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
2. Beckman Institute for Advanced Science and Technology, 405 N. Mathews Avenue, Urbana, Illinois 61801, United States
3. Dynamic Imaging & Radiography Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Institute of Optics, University of Rochester, 480 Intercampus Dr., Rochester, New York 14627, United States
5. Departments of Bioengineering, Chemical and Biomolecular Engineering, Mechanical Science and Engineering, and Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
6. Cancer Center at Illinois, Beckman Institute for Advanced Science and Technology, 405 N. Mathews Avenue, Urbana, Illinois 61801, United States