[1] I. V. Basisitiy, M. S. Soskin, and M. V. Vasnetsov, Opt. Commun. 119, 604 (1995).

[2] J. F. Nye and M. V. Berry, Proc. R. Soc. A 336, 165 (1974).

[3] C. T. Law, X. Zhang, and G. A. Swartzlander, Opt. Lett. 25, 55 (2000).

[4] W. M. Lee, X. C. Yuan, and W. C. Cheong, Opt. Lett. 29, 1796 (2004).

[5] K. Ladavac and D. G. Grier, Opt. Express 12, 1144 (2004).

[6] D. Cojoc, V. Garbin, E. Ferrari, L. Businaro, F. Romamato, and E. Di Fabrizio, Microelectron. Eng. 77-78, 125 (2005).

[7] N. R. Heckenberg, R. McDuff, C. P. Smith, and A. G. White, Opt. Lett. 17, 221 (1992).

[8] M. W. Beijersbergen, L. Allen, H. Vanderveen, and J. P. Woerdman, Opt. Commun. 96, 123 (1993).

[9] V. V. Kotlyar, A. A. Almazov, S. N. Khonina, and V. A. Soifer, J. Opt. Soc. Am. A 22, 849 (2005).

[10] X. Gao, Phys. Lett. A 360, 330 (2006).

[11] L. W. Casperson, Opt. Quantum Electron. 8, 537 (1976).

[12] X. Gao, F. Zhou, W. Xu, and F. Gan, Opt. Commun. 239, 55 (2004).

[13] X. Gao, F. Zhou, W. Xu, and F. Gan, Optik 116, 99 (2005).

[14] X. Gao, F. Zhou, F. Zhang, J. T. Yang, W. Xu, and F. Gan, Opt. Eng. 44, 063001 (2005).

[15] G.-H. Kim, J.-H. Jeon, K.-H. Ko, H.-J. Moon, J.-H. Lee, and J.-S. Chang, Appl. Opt. 36, 8614 (1997).

[16] M. Gu, Advanced Optical Imaging Theory (Springer, Heidelberg, 2000).

[17] D. Ganic, X. Gan, and M. Gu, Opt. Express 11, 2747 (2003).