[3] F. Zhu, J. Ma, W. Huang, J. Wang, C. Zhou. Chin. Opt. Lett., 12, 080501(2014).
[4] B. Yu, W. Jia, C. Zhou, H. Cao, W. Sun. Chin. Opt. Lett., 11, 080501(2013).
[5] L. Zeng, L. Li. Opt. Lett., 32, 1081(2007).
[6] D. Ma, L. Zeng. Opt. Lett., 40, 1346(2015).
[7] P. Young, P. Priambodo, T. Maldonado. Appl. Opt, 45, 4563(2006).
[8] A. Fitzgibbon, M. Pilu, R. Fisher. IEEE Trans. Pattern Anal. Mach. Intell., 21, 476(1999).