[1] Y. Feng and Z. Ling, Chin. Opt. Lett. 6, 858 (2008).
[2] C. Zhang and Z. Huang, Acta Opt. Sin. (in Chinese) 28, 1231 (2008).
[3] H. Ren, Y.-H. Fan, S. Gauza, and S.-T. Wu, Jpn. J. Appl. Phys. 43, 652 (2004).
[4] A. F. Naumov, M. Y. Loktev, I. R. Guralnik, and G. V. Vdovin, Proc. SPIE 3684, 18 (1998).
[5] Y.-H Lin, H. Ren, K.-H. Fan-Chiang, W.-K. Choi, S. Gauza, X. Zhu, and S.-T. Wu, Jpn. J. Appl. Phys. 44, 243 (2005).
[6] Z. He, T. Nose, and S. Sato, Jpn. J. Appl. Phys. 33, 1091 (1994).
[7] Z. He, T. Nose, and S. Sato, Jpn. J. Appl. Phys. 34, 2392 (1995).
[8] M. Ye, B. Wang, and S. Sato, Opt. Commun. 259, 710 (2006).
[9] P. G. de Gennes, The Physics of Liquid Crystals (Oxford University Press, London, 1974).