1. Department of Chemistry, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2. Department of Bioengineering, University of California, 420 Westwood Plaza, Los Angeles, California 90095, USA
3. Institute of Technological Sciences, Wuhan University, Wuchang District, Wuhan, Hubei 430072, People’s Republic of China
4. Department of Electrical and Computer Engineering, University of California, 420 Westwood Plaza, Los Angeles, California 90095, USA
5. California NanoSystems Institute, 570 Westwood Plaza, Los Angeles, California 90095, USA
6. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, No.390 Qinghe Road, Jiading District, Shanghai 201800, People’s Republic of China
7. Center for Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, People’s Republic of China
8. OFS Laboratories, 19 Schoolhouse Road, Suite-105, Somerset, New Jersey 08873, USA