1. MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics; Nankai Univ; Tianjin 300071 China
2. Food, Nutrition and Health Program, Faculty of Land and Food Systems; The Univ. of British Columbia; Vancouver V6T 1Z4 Canada
3. Dept. of Chemistry; The Univ. of British Columbia; Vancouver V6T 1Z1 Canada
4. Dept. of Mechanical and Industrial Engineering; Univ. of Illinois at Chicago; Chicago IL 60607 U.S.A
5. Key Laboratory of Food Nutrition and Safety, Ministry of Education of China; Tianjin Univ. of Science and Technology; Tianjin 300457 China
6. Inst. of Photoelectronics; Nankai Univ; Tianjin 300071 China