1. The Guo China‐US Photonics LaboratoryChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences Changchun Jilin 130033 China
2. Institute of Molecular MedicineRenji HospitalShanghai Jiao Tong University School of Medicine Shanghai 200120 China
3. School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200120 China
4. The Institute of OpticsUniversity of Rochester Rochester NY 14627 USA