[1] P. Kelkar, B. Tirri, R. Wilklow, and D. Peterson, Proc. SPIE 7067, 070608 (2008).
[2] H. J. Qi, M. P. Zhu, W. L. Zhang, K. Yi, H. B. He, and J. D. Shao, Chin. Opt. Lett. 10, 013104 (2012).
[3] M. Gross, S. Dligatch, and A. Chtanov, Appl. Opt. 50, C316 (2011).
[4] C. Guo, M. D. Kong, C. D. Liu, and B. C. Li, Appl. Opt. 52, B26 (2013).
[5] C. D. Liu, M. D. Kong, C. Guo, W. D. Gao, and B. C. Li, Opt. Express 20, 23790 (2012).
[6] J. B. Oliver and D. Talbot, Appl. Opt. 45, 3097 (2006).
[7] F. Villa, A. Martinez, and L. E. Regalado, Appl. Opt. 39, 1602 (2000).
[8] F. Villa and O. Pompa, Appl. Opt. 38, 695 (1999).
[9] C. Liu, C. Guo, M. Kong, and B. Li, Chin. Opt. Lett. 11, S10213 (2013).
[10] Y. Q. Hou, H. J. Qi, K. Yi, and J. D. Shao, Chin. Opt. Lett. 11, 103101 (2013).
[11] P. G. Antal and R. Szipocs, Chin. Opt. Lett. 10, 053101 (2012).
[12] R. Swanepoel, J. Phys. E Sci. Instrum. 16, 1214 (1983).