Yu Xiang-Hua, Yao Bao-Li, Li Xin-Yu, Liu Shi-Lei, Lei Ming, Li Run-Ze, Liang Yan-Sheng, Zhou Xing, Wu Di, Dan Dan, Min Jun-Wei, Yan Shao-Hui. F-state based permanent optical data storage in bacteriorhodopsin filmJ. Acta Physica Sinica, 2015, 64(2): 024218. DOI: 10.7498/aps.64.024218