[1] M. D. Malinsky, K. L. Kelly, G. C. Schatz, and R. P. Van Duyne, J. Phys. Chem. B 105, 2343 (2001).
[2] A. J. Haes and R. P. Van Duyne, J. Am. Chem. Soc. 124, 10596 (2002).
[3] S. Eustis and M. A. El-Sayed, Chem. Soc. Rev. 35, 209 (2006).
[4] A. Campion and P. Kambhampati, Chem. Soc. Rev. 27, 241 (1998).
[5] K. Kneipp, H. Kneipp, I. Itzkan, R. R. Dasari, and M. S. Feld, Chem. Rev. 99, 2957 (1999).
[6] S. Nie and S. R. Emory, Science 275, 1102 (1997).
[7] J. Zhu, Y. Zhang, L. Wu, Z. Wang, and Z. Sun, Chin. Opt. Lett. 6, 526 (2008).
[8] K. Liu, S. Wu, Y. Zhang, and H. Liu, Chin. Opt. Lett. 3, S161 (2005).
[9] S. Shi, Z. Cao, and Z. Sun, Chin. Opt. Lett. 1, 305 (2003).
[10] X. Hong and F.-J. Kao, Appl. Opt. 43, 2868 (2004).
[11] H. Takei, Proc. SPIE 3515, 278 (1998).
[12] H. Raether, Surface Plasmons on Smooth and Rough Surfaces and Gratings (Springer-Verlag, Berlin, 1988) pp.4-13.