[1] M. Olivero and M. Svalgaard, Opt. Express 14, 162 (2006).
[2] K. B. Chung and J. S. Yoon, Opt. Quantum Electron. 35, 959 (2003).
[3] M. Bayindir, B. Temelkuran, and E. Ozbay, Appl. Phys. Lett. 77, 3902 (2000).
[4] G. Veronis and S. Fan, Appl. Phys. Lett. 87, 131102 (2005).
[5] S.-Y. Tseng, S. Choi, and B. Kippelen, Opt. Lett. 34, 512 (2009).
[6] X. Tang, J. Liao, H. Li, R. Lu, and Y. Liu, Acta Opt. Sin. (in Chinese) 29, 2077 (2009).
[7] R. Thapliya, T. Kikuchi, and S. Nakamura, Appl. Opt. 46, 4155 (2007).
[8] X. Tang, J. Liao, H. Li, R. Lu, Y. Liu, and M. Dong, Optoelectron. Lett. 5, 401 (2009).
[9] S. M. Garner, J. S. Cites, M. He, and J. Wang, Appl. Phys. Lett. 84, 1049 (2004).
[10] L. R. Dalton, Thin Solid Films 518, 428 (2009).
[11] X. Liu, P. Lu, and D. Liu, Chinese J. Lasers (in Chinese) 32, 511 (2005).
[12] J. Liao, H. Li, X. Tang, R. Lu, X. Zhang, and Y. Liu, Acta Opt. Sin. (in Chinese) 30, 1597 (2010).