1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, People’s Republic of China
2. Advanced Membranes and Porous Materials Center (AMPM), KAUST Catalysis Center, Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
3. Photonics Research Institute, The Hong Kong Polytechnic University, Hong Kong 999077, People’s Republic of China