1. Center of Super‐Diamond and Advanced Films (COSDAF)Department of ChemistryCity University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR P. R. China
2. Laboratory for NanoMedical PhotonicsSchool of Basic Medical ScienceHenan University Kaifeng 475004 P. R. China
3. Department of Biomedical EngineeringCity University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR P. R. China