[1] [1] J. Durnin, J. J. Miceli, and J. H. Eberly, Phys. Revs. Lett. 58, 1499 (1987).

[2] [2] J. Durnin, J. J. Miceli, and J. H. Eberly, Opt. Lett. 13, 79 (1988).

[3] [3] F. O. Fahrbach, P. Simon, and A. Rohrbach, Nat. Photon. 4, 780 (2010).

[4] [4] S. Tao and X. Yuan, J. Opt. Soc. Am. A 21, 1192 (2004).

[5] [5] Z. Bouchal, J. Wagner, and M. Chlup, Opt. Commun. 151, 207 (1998).

[6] [6] Z Bouchal, Opt. Commun. 210, 155 (2002).

[7] [7] F. O. Fahrbach and A. Rohrbach, Opt. Express 18, 24229 (2010).

[8] [8] F. O. Fahrbach and A. Rohrbach, Nat. Commun. 3, 1646 (2012).

[9] [9] T. Ersoy, B. Yalizay, and S. Akturk, J. Quantitative Spectroscopy & Radiative Transfer 113, 2470 (2012).

[10] [10] I. L. Katsev, A. S. Prikhach, N. S. Kazak, and M. Kroening, Quantum Electron. 36, 357 (2006).

[11] [11] A. Rohrbach, Opt. Lett. 34, 3041 (2009).

[12] [12] S. K. Tiwari, S. R. Mishra, S. P. Ram, and H. S. Rawat, Appl. Opt. 51, 3718 (2012).

[13] [13] O. Brzobohaty, T. Cizmar, and P. Zemanek, Opt. Express 16, 12688 (2008).

[14] [14] R. Arimoto, C. Saloma, T. Tanaka, and S. Kawata, Appl. Opt. 31, 6653 (1992).

[15] [15] G. Milne, G. D. M. Jeffries, and D. T. Chiu, Appl. Phys. Lett. 92, 261101 (2008).

[16] [16] T. Cizmar and K. Dholakia, Opt. Express 17, 15558 (2009).

[17] [17] J. Zheng, Y. Yang, M. Lei, B. Yao, P. Gao, and T. Ye, Appl. Opt. 51, 7236 (2012).

[18] [18] C. Vecchio and P. Lewin, J. Opt. Soc. Am. 95, 2399 (1994).

[19] [19] P. Gao, B. Yao, I. Harder, J. Min, R. Guo, J. Zheng, and T. Ye, J. Opt. Soc. Am. A 28, 434 (2011).

[20] [20] M. Born and E. Wolf, Principles of Optics (Cambridge University Press, Cambridge, 1999).

[21] [21] M. D. Feit and J. A. Fleck, Jr., Appl. Opt. 17, 3390 (1978).

[22] [22] K.-H. Brenner and W. Singer, Appl. Opt. 32, 4984 (1993).

[23] [23] E. Alerstam, T. Svensson, and S. Andersson-Engels, J. Biomed. Opt. 13, 060504 (2008).

[24] [24] W. Cai and L. Ma, Chin. Opt. Lett. 10, 012901 (2012).

[25] [25] N. Ren, H. Zhao, S. Zhu, X. Qu, H. Liu, Z. Hu, J. Liang, and J. Tian, Chin. Opt. Lett. 9, 041701 (2011).

[26] [26] M. Fertig and K.-H. Brenner, J. Opt. Soc. Am. A 27, 709 (2010).

[27] [27] P. Dufour, M. Piche, Y. De Koninck, and N. McCarthy, Appl. Opt. 45, 9246 (2006).