[1] [1] Lee Yun-Shik. Principles of Terahertz Science and Technology[M]. NY: Springer, 2008.

[2] [2] Ferguson B, Zhang X C. Materials for terahertz science and technology[J]. Nature Materials, 2002, 1(1): 26-33.

[3] [3] Nagel M, Bolivar P H, Brucherseifer M, et al. Integrated THz technology for label-free genetic diagnostics[J]. Applied Physics Letters, 2002, 80(1): 154-156.

[4] [4] Tonouchi M. Cutting-edge terahertz technology[J]. Nature Photonics, 2007, 1(2): 97-105.

[5] [5] Shelby R A, Smith D R, Schultz S. Experimental verification of a negative index of refraction[J]. Science, 2001, 292(5514): 77-79.

[6] [6] Schurig D, Mock J J, Justice B J, et al. Metamaterial electromagnetic cloak at microwave frequencies[J]. Science, 2006, 314(5801): 977-980.

[7] [7] Wang Jianbo, Chen Xinyi, Chen Guibo, et al. Characterization of terahertz metamaterials based on hexagonal split-ring resonators[J]. Infrared and Laser Engineering, 2012, 41(3)622-625. (in Chinese)

[8] [8] Padilla W J, Aronsson M T, Highstrete C, et al. Highly flexible wide angle of incidence terahertz metamaterial absorber: design, fabrication, and characterization[J]. Phys Rev B, 2007, 78: 241103.

[9] [9] Soukoulis C M, Linden S, Wegener M. Negative refractive index at optical wavelengths[J]. Science, 2007, 315(5808): 47-49.

[10] [10] Peralta Xomalin G, Smirnova Evgenya I, Azad Abul K, et al. Metamaterials for THz polarimetric devices[J]. Optics Express, 2009, 17: 773.

[11] [11] Landy N I, Sajuyigbe S, Mock J J, et al. Perfect metamaterial absorber[J]. Physical Review Letters, 2008, 100(20): 207402.

[12] [12] Tao H, Landy N I, Bingham C M, et al. A metamaterial absorber for the terahertz regime: Design, fabrication and characterization[J]. Optics Express, 2008, 16(10): 7181-7188.

[13] [13] Xu Z C, Gao R M, Ding C F, et al. Photoexcited broadband blueshift tunable perfect terahertz metamaterial absorber[J]. Optical Materials, 2015, 42: 148-151.

[14] [14] Cao Xiaolong, Yao Jianquan, Che Yongli. Transmission characteristic of asymmetric double-split ring resonator in terahertz wavelength[J]. Infrared and Laser Engineering, 2014, 43(11): 3854-3858. (in Chinese)