[1] A. Armstrong, N. Bloembergen, J. Ducuing, and P. S. Pershan, Phys. Rev. 127, 1918 (1962).

[2] N. Bloembergen and A. J. Sievers, Appl. Phys. Lett. 17, 483 (1970).

[3] Y. Chen, J. Zhang, and H. Li, Chin. Opt. Lett. 11, 031601 (2013).

[4] B. F. Johnston, P. Dekker, S. M. Saltiel, Y. S. Kivshar, and M. J. Withford, Opt. Express 15, 13630 (2007).

[5] Y. Y. Zhu, Y. Q. Qin, C. Zhang, S. N. Zhu, and N. B. Ming, J. Phys. 12, 10639 (2000).

[6] R. Lifshitz, A. Arie, and A. Bahabad, Phys. Rev. Lett. 95, 133901 (2005).

[7] B. Ma, M. Ren, and Z. Li, Chin. Opt. Lett. 10, S21904 (2012).

[8] X. F. Chen, F. Wu, X. L. Zeng, Y. P. Chen, Y. X. Xia, and Y. L. Chen, Phys. Rev. A 69, 013818 (2004).

[9] M. A. Arbore, O. Marco, and M. M. Fejer, Opt. Lett. 22, 865 (1997).

[10] Y. W. Lee, F. C. Fan, Y. C. Huang, B. Y. Gu, and B. Z. Dong, Opt. Lett. 27, 2191 (2002).

[11] X. Gu, X. F. Chen, Y. P. Chen, X. L. Zeng, Y. X. Xia, and Y. L. Chen, Opt. Commun. 237, 53 (2004).

[12] L. J. Chen, X. F. Chen, Y. P. Chen, and Y. X. Xia, Phys. Lett. A 349, 484 (2006).

[13] X. Vidal and J. Martorell, Phys. Rev. Lett. 97, 013902 (2006).

[14] R. Fischer, S. M. Saltiel, D. N. Neshev, W. Krolikowski, and Y. S. Kivshar, Appl. Phys. Lett. 89, 191105 (2006).

[15] L. M. Zhao, G. K. Yue, and Y. S. Zhou, Europhys. Lett. 99, 34002 (2012).

[16] L. M. Zhao, B. Y. Gu, G. Z. Yang, and Y. S. Zhou, J. Nonlinear Opt. Phys. Mater. 14, 115 (2005).

[17] R. Buffa and S. Cavalieri, J. Opt. Soc. Am. B 17, 1901 (2000).

[18] L. M. Zhao, G. K. Yue, Y. S. Zhou, and F. H. Wang, Opt. Express 21, 17592 (2013).

[19] U. K. Sapaev and G. Assanto, Opt. Express 15, 7448 (2007).

[20] J. H. Yuan, J. Yang, W. B. Ai, and T. P. Shuai, Opt. Commun. 315, 381 (2014).

[21] J. Jones, L. Zhu, N. Tolk, and R. Mu, in MRS Online -Proceedings Library 912 (2013).