[1] [1] T. Hübert, L. Boon-Brett, G. Black, and U. Banach, Sens. Actuators B Chem. 157, 329 (2011).

[2] [2] Q. Wang and Q. Yu, Chin. Opt. Lett. 8, 266 (2010).

[3] [3] T. Hu, Y. Zhao, X. Li, J. Chen, and Z. Lu, Chin. Opt. Lett. 8, 392 (2010).

[4] [4] J. Zhang, H. Sun, Q. Rong, Y. Ma, L. Liang, Q. Xu, P. Zhao, Z. Feng, M. Hu, and X. Qiao, Chin. Opt. Lett. 10, 070607 (2012).

[5] [5] F. Chen, J. Hu, C. Zhang, and Z. Lin, Chin. Opt. Lett. 10, 060601 (2012).

[6] [6] C. L. Tien, H. W. Chen, W. F. Liu, S. S. Jyu, S. W. Lin, and Y. S. Lin, Thin Solid Films. 516, 5360 (2008).

[7] [7] K. S. Park, Y. H. Kim, J. B. Eom, S. J. Park, M. S. Park, J. H. Jang, and B. H. Lee, Opt. Express 19, 18190 (2011).

[8] [8] V. P. Minkovich and D. Monzón-Hernández, Opt. Express. 14, 8413 (1998).

[9] [9] Y. J. Rao, Opt Fiber Technol. 12, 227 (2006).

[10] [10] J. Dai, M. Yang, X. Yu, and H. Lu, Opt Fiber Technol. 19, 26 (2013).

[11] [11] M. Wang, M. Yang, J. Cheng, G. Zhang, C. R. Liao, and D. N. Wang, IEEE Photon. Technol. Lett. 25, 713 (2013).

[12] [12] Y. Zhang, Q. S. Li, Z. Zhuang, M. Zhang, Z. Yang, and Y. B. Liao, in Proceedings of 21st International Conference on Optical Fiber Sensors, W. J. Bock, J. Albert, and X. Bao (eds) (Ottawa, Canada, 2011).