[1] [1] H. Wang, E. C. Y. Yan, E. Borguet and K. B. Eisenthal, Chemical Physics Letters 259, 15 (1996).

[2] [2] J. Butet, J. Duboisset, G. Bachelier, I. Russier-Antoine, E.Benichou, C. Jonin and P. -F. Brevet, Nano Letters 10, 1717(2010).

[3] [3] P. C. Ray, Angewandte Chemie International Edition 45, 1151(2006).

[4] [4] S. Wunderlich, U. Peschel, B. Schurer and W. Peukert, Investigating the Surface of Nanoparticles by Second Harmonic Generation, Lasers and Electro-Optics (LEO) and Quantum Electronics and Laser Science (QELS) Conference, 2010.

[5] [5] P. C. Ray, Chemical Reviews 110, 5332 (2010).

[6] [6] H. Ishitobi, I. Nakamura, N. Hayazawa, Z. Sekkat and S. Kawata,Journal of Physical Chemistry B 114, 2565 (2010).

[7] [7] B. Huo, X. Wang, S. Chang, M. Zeng and G. Zhao, Journal of the Optical Society of America B 28, 2702 (2011).

[8] [8] J. Mertz and L. Moreaux, Optics Communications 196, 325(2001).

[9] [9] J. I. Dadap, Physical Review B 78, 205322 (2008).

[10] [10] FANG Gui-juan, SUN Shun-hong, TAO Hua and PU Jixiong,Journal of Optoelectronics Laser 22, 1885 (2011).(in Chinese)

[11] [11] Y. Kozawa and S. Sato, Journal of the Optical Society of America B 25, 175 (2008).

[12] [12] CHEN Guang-ming, LIN Hui-chuan and PU Ji-xiong, Journal of Optoelectronics Laser 22, 945 (2011). (in Chinese)

[13] [13] Z. Bomzon and M. Gu, Optics Letters 32, 3017 (2007).

[14] [14] J. I. Dadap, J. Shan and T. F. Heinz, Journal of the Optical Society of America B 21, 1328 (2004).

[15] [15] D. Krause, C. W. Teplin and C. T. Rogers, Journal of Applied Physics 96, 3626 (2004).

[16] [16] S. H. Jen, H. L. Dai and G. Gonella, Journal of Physical Chemistry 114, 4302 (2010).

[17] [17] L. Cao, N. C. Panoiu, R. D. R. Bhat and J. R. M. Osgood,Physical Review B: Condensed Matter and Materials Physics79, 235416 (2009).

[18] [18] M. Hashimoto, K. Ashida, K. Yoshiki and T. Araki, Optics Letters 34, 1423 (2009).