Department of Physics, Yale University, New Haven, Connecticut, United States of America.|Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America.|Delaware Biotechnology Institute, Bioimaging Center, Newark, Delaware, United States of America.|Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America.|Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America, Department of Applied Physics, Yale University, New Haven, Connecticut, United States of America.