[1] S.-Y. Wu and H. Ho, Chin. Opt. Lett. 6, 176 (2008).

[2] B. Cunningham, P. Li, B. lin, and J. Pepper, Sensors and Actuators B 81, 316 (2002).

[3] V. S.-Y. Lin, K. Motesharei, K.-P. S. Dancil, M. J. Sailor, and M. R. Ghadiri, Science 278, 840 (1997).

[4] F. Morhard, J. Pipper, R. Dahint, and M. Grunze, Sensors and Actuators B 70, 232 (2000).

[5] E. Chow, A. Grot, L. W. Mirkarimi, M. Sigalas, and G. Girolami, Opt. Lett. 29, 1093 (2004).

[6] X. Wang, Z. Xu, N. Lu, J. Zhu, and G. Jin, Opt. Commun. 281, 1725 (2008).

[7] M. Lee and P. M. Fauchet, Opt. Express 15, 4530 (2007).

[8] H. A. Haus, Waves and Fields in Optoelectronics (Prentice-Hall, Englewood Cliffs, 1985) p.68.

[9] Z. Xu, L Cao, C. Gu, Q. He, and G. Jin, Opt. Express 14, 298 (2006).