[1] C. Wu, C. H. Crouch, L. Zhao, and E. Mazur, Appl. Phys. Lett. 81, 1999 (2002).

[2] Y. Wu, C.-Y. Wang, W. Jia, X. Ni, M. Hu, and L. Chai, Chin. Opt. Lett. 6, 51 (2008).

[3] C. B. Schaffer, J. F. García, and E. Mazur, Appl. Phys. A 76, 351 (2003).

[4] C. B. Schaffer, A. Brodeur, J. F. García, and E. Mazur, Opt. Lett. 26, 93 (2001).

[5] A. Y. Vorobyev and C. Guo, Opt. Express 14, 2164 (2006).

[6] J. Xie, C. Zhou, E. Dai, and Z. Han, Opt. Commun. 281, 5396 (2008).

[7] Z. Han, C. Zhou, and E. Dai, Chin. Opt. Lett. 6, 619 (2008).

[8] J. Wang and C. Guo, Appl. Phys. Lett. 87, 251914 (2005).

[9] J. F. Young, J. S. Preston, H. M. van Driel, and J. E. Sipe, Phys. Rev. B 27, 1155 (1983).

[10] T.-H. Her, R. J. Finlay, C. Wu, S. Deliwala, and E. Mazur, Appl. Phys. Lett. 73, 1673 (1998).

[11] D. B. Wolfe, J. B. Ashcom, J. C. Hwang, C. B. Schaffer, E. Mazur, and G. M. Whitesides, Adv. Mater. 15, 62 (2003).

[12] K.-S. Lee, D.-Y. Yang, S. H. Park, and R. H. Kim, Polym. Adv. Technol. 17, 72 (2006).

[13] E. Dai, C. Zhou, and G. Li, Opt. Express 13, 6145 (2005).

[14] K. Venkatakrishnan, B. Tan, P. Stanley, and N. R. Sivakumar, J. Appl. Phys. 92, 1604 (2002).

[15] C. Hnatovsky, R. S. Taylor, E. Simova, P. P. Rajeev, D. M. Rayner, V. R. Bhardwaj, and P. B. Corkum, Appl. Phys. A 84, 47 (2006).