Affiliation: | 1. Department of Physics, Hong Kong Baptist University (HKBU), Kowloon, Hong Kong SAR, China;2. Institute of Advanced Materials, Partner State Key Laboratory of Environmental and Biological Analysis, HKBU, Kowloon, Hong Kong SAR, China;3. HKBU Institute of Research and Continuing Education, 9F, the Industrialization Complex of Shenzhen Virtual University Park, Shenzhen, Guangdong Province, China |