1. Department of ChemistryCity University of Hong Kong Tat Chee Avenue Hong Kong P. R. China
2. Department of ChemistryThe Hong Kong University of, Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
3. State Key Laboratory of Terahertz and Millimeter WavesCity University of Hong Kong Tat Chee Avenue Hong Kong P. R. China
4. Center of Functional PhotonicsCity University of Hong Kong Tat Chee Avenue Hong Kong P. R. China