1. Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
2. State Key Laboratory of Millimeter Waves; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
3. Center for Functional Photonics; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China