[1] P Gunter, J-P Huingard. Photorefractive Materials and Their Applications I: Fundamental Phenomena [M]. Berlin: Springer, 1988.

[2] S Harris, J Field, A Imanolu. Nonlinear optical processes using electromagnetically induced transparency [J]. Phys Rev Lett, 1990, 64(10): 1107-1110.

[3] S E Harris. Electromagnetically induced transparency [J]. Phys Today, 1997, 50(7): 36-42.

[4] B Corcoran, C Monat, C Grillet, et al.. Green light emission in silicon through slow-light enhanced third-harmonic generation in photonic-crystal waveguides [J]. Nature Photon, 2009, 3(4): 206-210.

[5] S A Maier. Plasmonics: Fundamentals and Applications [M]. Berlin: Springer, 2007.

[6] M Fleischmann, P J Hendra, A J Mcquillan. Raman spectra of pyridine adsorbed at a silver electrode [J]. Chem Phys Lett, 1974, 26(2): 163-166.

[7] K Macdonald, Z Smson, M Stockman, et al.. Ultrafast active plasmonics [J]. Nature Photon, 2008, 3(1): 55-58.

[8] C K Chen, T F Heinz, D Ricard, et al.. Surface-enhanced second-harmonic generation and Raman scattering [J]. Phys Rev B, 1983, 27(4): 1965-1979.

[9] D Ricard, P Roussignol, C Flytzanis. Surface-mediated enhancement of optical phase conjugation in metal colloids [J]. Opt Lett, 1985, 10(10): 511-513.

[10] D Cho, W Wu, E Ponizovskaya, et al.. Ultrafast modulation of optical metamaterials [J]. Opt Express, 2009, 17(20): 17652-17657.

[11] K M Dani, Z Ku, P C Upadhya, et al.. Subpicosecond optical switching with a negative index metamaterial [J]. Nano Lett, 2009, 9(10): 3565-3569.

[12] G Wurtz, R Pollard, W Hendren, et al.. Designed ultrafast optical nonlinearity in a plasmonic nanorod metamaterial enhanced by nonlocality [J]. Nature Nano, 2011, 6(2): 107-111.

[13] S Tang, D J Cho, H Xu, et al.. Nonlinear responses in optical metamaterials: theory and experiment [J]. Opt Express, 2011, 19(19): 18283-18293.

[14] M Kauranen, A V Zayats. Nonlinear plasmonics [J]. Nature Photon, 2012, 6(11): 737-748.

[15] N I Zheludev, Y S Kivshar. From metamaterials to metadevices [J]. Nature Mater, 2012, 11(11): 917-924.

[16] M Ren, B Jia, J-Y Ou, et al.. Nanostructured plasmonic medium for terahertz bandwidth all-optical switching [J]. Adv Mater, 2011, 23(46): 5540-5544.

[17] M Ren, J Y Ou, B Jia, et al.. Functional photonic metamaterials [C]. Proceedings of the Photonics Conference (PHO), 2011.

[18] M Ren, E Plum, J Xu, et al.. Giant nonlinear optical activity in a plasmonic metamaterial [J]. Nature Commun, 2012, 3(5): 833.

[19] J D Jackson. Classical Electrodynamics [M]. New York: Wiley, 1965.

[20] F Hache, D Ricard, C Flytzanis. Optical nonlinearities of small metal particles: surface-mediated resonance and quantum size effects [J]. J Opt Soc Am B, 1986, 3(12): 1647-1655.

[21] H Ma, R Xiao, P Sheng. Third-order optical nonlinearity enhancement through composite microstructures [J]. J Opt Soc Am B, 1998, 15(3): 1022-1029.

[22] N E Christensen, B O Seraphin. Relativistic band calculation and the optical properties of gold [J]. Phys Rev B, 1971, 4(10): 3321-3344.

[23] S Vavilov. The Microstructure of Light [M]. Moscow: Izd Akad Nauk SSSR, 1950. 383-544.

[24] Y P Svirko, N Zheludev. Polarization of Light in Nonlinear Optics [M]. New York: Wiley, 1998.

[25] S Akhmanov, V Zharikov. Nonlinear optics of gyrotropic media [J]. JETP Lett, 1967, 6(5): 137-140.

[26] P Atkins, L Barron. Quantum field theory of optical birefringence phenomena. I. Linear and nonlinear optical rotation [J]. Proc R Soc Lond A, 1968, 304(1478): 303-317.

[27] S Akhmanov, B Zhdanov, N Zheludev, et al.. Nonlinear optical activity in crystals [J]. JETP Lett, 1979, 29(5): 264-267.

[28] R Cameron, G C Tabisz. Observation of two-photon optical rotation by molecules [J]. Mol Phys, 1997, 90(2): 159-164.

[29] P Markowicz, M Samoc, J Cerne, et al.. Modified Z-scan techniques for investigations of nonlinear chiroptical effects [J]. Opt Express, 2004, 12(21): 5209-5214.

[30] H Mesnil, F Hache. Experimental evidence of third-order nonlinear dichroism in a liquid of chiral molecules [J]. Phys Rev Lett, 2000, 85(20): 4257-4260.

[31] H Mesnil, M Schanne-Klein, F Hache, et al.. Experimental observation of nonlinear circular dichroism in a pump-probe experiment [J]. Chem Phys Lett, 2001, 338(4-6): 269-276.

[32] E Plum, V Fedotov, N Zheludev. Extrinsic electromagnetic chirality in metamaterials [J]. J Opt A, 2009, 11(7): 074009.

[33] E Plum, X X Liu, V A Fedotov, et al.. Metamaterials: optical activity without chirality [J]. Phys Rev Lett, 2009, 102(11): 113902.