1. Department of Polymer Science, The University of Akron, Akron, OH 44325, USA.
2. Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
3. Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093, USA.
4. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA.
5. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, P. R. China.
6. Photonics Research Group, Department of Information Technology, Ghent University–imec, Center for Nano- and Biophotonics (NB-Photonics), 9000 Ghent, Belgium.
7. Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai 200240, China.
8. Evolution and Optics of Nanostructures Group, Department of Biology, The University of Ghent, 9000 Ghent, Belgium.
9. Department of Biology and Integrated Bioscience Program, University of Akron, Akron, OH 44325, USA.