1. Laboratory for Photochemistry and Spectroscopy, Division for Molecular Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Leuven 3000, Belgium
2. Department of Applied Chemistry, College of Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
3. Laser Science Laboratory, Toyota Technological Institute, Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
4. Division of Chemical Physics and NanoLund, Lund University, P.O. Box 124, Lund 221 00, Sweden
5. Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 30010, Taiwan
6. Max Planck Institute for Polymer Research, Mainz 55128, Germany