1. Center for Biological Physics, Arizona State University, Tempe, Arizona 85287, United States
2. Department of Physics, Arizona State University, Tempe, Arizona 85287, United States
3. Department of Biomedical Engineering, University of California Irvine, Irvine, California 92697, United States
4. Laboratory of Fluorescence Dynamics, The Henry Samueli School of Engineering, University of California, Irvine, California 92697, United States
5. School of Molecular Science, Arizona State University, Tempe, Arizona 85287, United States