[1] E. Ozbay, Science 311, 189 (2006).

[2] H. Zhao, X. Huang, and H. Su, Acta Opt. Sin. (in Chinese) 27, 1649 (2007).

[3] H. Raether, Surface Plasmons (Springer, Berlin, 1988).

[4] S. I. Bozhevolnyi, V. S. Volkov, E. Devaux, J.-Y. Laluet, and T. W. Ebbesen, Nature 440, 508 (2006).

[5] S. I. Bozhevolnyi, V. S. Volkov, E. Devaux, and T. W. Ebbesen, Phys. Rev. Lett. 95, 046802 (2005).

[6] D. K. Gramotnev and D. F. P. Pile, Appl. Phys. Lett. 85, 6323 (2004).

[7] M. P. Nezhad, K. Tetz, and Y. Fainman, Opt. Express 12, 4072 (2004).

[8] M. Hochberg, T. Baehr-Jones, C. Walker, and A. Scherer, Opt. Express 12, 5481 (2004).

[9] D. J. Bergman and M. I. Stockman, Phys. Rev. Lett. 90, 027402 (2003).

[10] S. S. A. Obayya, B. M. A. Rahman, K. T. V. Grattan, and H. A. El-Mikati, J. Lightwave Technol. 20, 1054 (2002).

[11] K. Saitoh and M. Koshiba, IEEE J. Quantum Electron. 38, 927 (2002).

[12] M. Koshiba, Optical Waveguide Theory by the Finite Element Method (KTK, Holland, 1992).

[13] J. M. Jin, The Finite Element Method in Electromagnetics (Wiley, New York, 1993).

[14] M. Koshiba and Y. Tsuji, J. Lightwave Technol. 18, 737 (2000).

[15] C. L. Xu, W. P. Huang, and S. K. Chaudhuri, J. Lightwave Technol. 11, 1209 (1993).

[16] D. Schulz, C. Glingener, M. Bludszuweit, and E. Voges, J. Lightwave Technol. 16, 1336 (1998).

[17] W. P. Huang, C. L. Xu, W. Lui, and K. Yokoyama, IEEE Photon. Technol. Lett. 8, 649 (1996).

[18] M. Koshiba, Y. Tsuji, and M. Hikari, IEEE Trans. Magn. 35, 1482 (1999).

[19] G. Veronis and S. Fan, Proc. SPIE 6123, 612308 (2006).

[20] A. Karalis, E. Lidorikis, M. Ibanescu, J. D. Joannopoulos, and M. Soljacic, Phys. Rev. Lett 95, 063901 (2005).