1. Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical Engineering, California Institute of Technology, Pasadena, California 91125, United States
2. Department of Chemistry & Biochemistry, George Mason University, 4400 University Drive, Fairfax, Virginia 22030, United States
3. Inova Schar Cancer Institute, 8081 Innovation, Park Drive, Fairfax, Virginia 22031, United States
4. Research and Post Graduate Department of Chemistry, MES Keveeyam College, Valanchery, Kerala 676552, India