[1] [1] G. Brambilla, J. Opt. 12, 043001 (2010).

[2] [2] M. Sumetsky, Opt. Express 12, 2303 (2004).

[3] [3] F. Xu, G. Brambilla, J. Feng, and Y. Lu, IEEE Photon. Technol. Lett. 22, 218 (2010).

[4] [4] H. Yi, Y. Zhu, and Z. Zhou, Chin. Opt. Lett. 7, 312 (2009).

[5] [5] L. Zhang, F. Gu, J. Lou, X. Yin, and L. Tong, Opt. Express 16, 13349 (2008).

[6] [6] H. Zhu, Y. Wang, and B. Li, ACS Nano 3, 3110 (2009).

[7] [7] Y. Wu, Y. Rao, Y. Chen, and Y. Gong, Opt. Express 17, 18142 (2009).

[8] [8] M. Tonezzer and R. G. Lacerda, Sensor Actuat. B Chem. 150, 517 (2010).

[9] [9] M. Belal, Z. Song, Y. Jung, G. Brambilla, and T. P. Newson, Opt. Lett. 35, 3045 (2010).

[10] [10] A. Iadicicco, A. Cusano, A. Cutolo, R. Bernini, and M. Giordano, IEEE Photon. Technol. Lett. 16, 1149 (2004).

[11] [11] B. Lin, S. C. Tjin, G. Wang, and P. Shum, Phys. Procedia. 19, 315 (2011).

[12] [12] J. Kou, M. Ding, J. Feng, Y. Lu, F. Xu, and G. Brambilla, Sensors 12, 8861 (2012).

[13] [13] X. Fang, C. Liao, and D. Wang, Opt. Lett. 35, 1007 (2010).

[14] [14] H. Xuan, W. Jin, and M. Zhang, Opt. Express 17, 21882 (2009).

[15] [15] M. Ding, M. N. Zervas, and G. Brambilla, Opt. Express 19, 15621 (2011).

[16] [16] Y. Liu, C. Meng, A. P. Zhang, Y. Xiao, H. Yu, and L. Tong, Opt. Lett. 36, 3115 (2011).

[17] [17] W. Luo, J. Kou, Y. Chen, F. Xu, and Y. Lu, Appl. Phys. Lett. 101, 133502 (2012).

[18] [18] J. Kou, S. Qiu, F. Xu, and Y. Lu, Opt. Express 19, 18452 (2011).

[19] [19] Y. Ran, Y. Tan, L. Sun, S. Gao, J. Li, L. Jin, and B. Guan, Opt. Express 19, 18577 (2011).

[20] [20] Y. Ran, L. Jin, Y. Tan, L. Sun, J. Li, and B. Guan, IEEE Photon. J. 4, 180 (2012).

[21] [21] J. Canning, J. Sens. 2009, 871580 (2009).

[22] [22] Y. Zhang, B. Lin, S. C. Tjin, H. Zhang, G. Wang, P. Shum, and X. Zhang, Opt. Express 18, 26345 (2010).

[23] [23] A. Yariv, IEEE J. Quantum Electron. QE-9, 919 (1973).

[24] [24] Y. Jung, G. Brambilla, and D. J. Richardson, Opt. Express 16, 14661 (2008).

[25] [25] A. W. Snyder and J. D. Love, Optical Waveguide Theory (Chapman and Hall, New York, 1983).

[26] [26] T. A. Birks and Y. W. Li, J. Lightwave Technol. 10, 432 (1992).

[27] [27] Y. Chen and Z. Ma, Experiment Science and Technology 6, 16 (2010).