[1] M. D. DeMerchant, A. Brown, X. Bao, and T. Bremner, Appl. Opt. 38, 2755 (1999).

[2] A. J. Rogers, Meas. Sci. Technol. 10, 75 (1999).

[3] A. Sun, B. Chen, J. Chen, G. Li, L. Wang, L. Chang, and Z. Lin, Opt. Eng. 46, 124401 (2007).

[4] T. Horiguchi and M. Tateda, J. Lightwave Technol. 7, 1170 (1989).

[5] J. Zhang, X. Qiao, M. Hu, Z. Feng, H. Gao, Y. Yang, and R. Zhou, Chin. Opt. Lett. 9, 090606 (2011).

[6] R. Shu, J. Chen, and Z. Chen, Chin. J. Sensors and Actuators (in Chinese) 20, 554 (2007).

[7] Y. Weng, X. Qiao, Z. Feng, M. Hu, J. Zhang, and Y. Yang, Chin. Opt. Lett. 9, 100604 (2011).

[8] T. R. Parker, M. Farhadiroushan, V. A. Handerek, and A. J. Rogers, Opt. Lett. 22, 787 (1997).

[9] S. M. Maughan, H. H. Kee, and T. P. Newson, Meas. Sci. Technol. 12, 834 (2001).

[10] P. C. Wait, K. De Souza, and T. P. Newson, Opt. Com- mun. 144, 17 (1997).