1. College of Optoelectronic Engineering Key Lab of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province Shenzhen University Shenzhen 518060 China
2. Biophotonics Research Laboratory Center of Interdisciplinary Biomedical Education and Research College of Mathematics and Science University of Central Oklahoma Oklahoma 73034 USA
3. Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Hong Kong 999077 China