1 Veselago V G. The electrodynamics of substances with simultaneously negative values of ε and μ. Sov Phys Usp, 1968, 10: 509-514509？？
[2]
4 Cao Y J, Wen G J, Wu K M, et al. A novel approach to design microwave medium of negative refractive index and simulation verification.Chinese Sci Bull, 2007, 52: 433-439433？？
[3]
8 Notomi M. Theory of light propagation in strongly modulated photonic crystals: Refractionlike behavior in the vicinity of the photonicband gap. Phys Rev B, 2000, 62: 10696-1070610696？？
[4]
9 Guven K, Aydin K, Alici K B, et al. Spectral negative refraction and focusing analysis of a two-dimensional left-handed photonic crystallens. Phys Rev B, 2004, 70: 205125-205130205125？？
[5]
10 Fang Y T, Sun H J, Shen T G. New evidences of negative refraction in photonic crystals. Opt Mater, 2006, 28: 1156-11591156？？
[6]
11 Fang Y T, Shen T G. Multi-imaging by photonic crystal slab using negative refraction. Chin Phys Lett, 2005, 22: 949-951949？？
[7]
13 Li Z H, Xue Y L, Deng Z Q, et al. Study on optical switching effect of photonic crystals with negative effective index of refraction. Optik,2009, 120: 605-609605
[8]
14 Sharon A, Rosenblatt D, Friesem A A. Narrow spectral bandwidths with grating waveguide structures. Appl Phys Lett, 1996, 69: 4154-41564154？？
[9]
2 Shelby R A, Smith D R, Schultz S. Experimental verification of a negative index of refraction. Science, 2001, 292: 77-7977？？
[10]
3 Zhao Q, Zhao X P, Kang L, et al. Reflection and phase of left-handed metamaterials at microwave frequencies. Chinese Sci Bull, 2005, 50:395-398395？？
[11]
5 Pendry J B. Negative refraction makes a perfect lens. Phys Rev Lett, 2000, 85: 3966-39693966？？
[12]
6 Rao X S, Ong C K. Subwavelength imaging by a left-handed material superlens. Phys Rev E, 2003, 68: 067601-067603067601？？
[13]
7 Wang G, Fang J R, Dong X T. Resolution of Near-field microwave target detection and imaging by using flat LHM lens. IEEE Trans AntennasPropog, 2007, 55: 3534-35413534
[14]
12 Yee K S. Numerical solution of initial boundary value problems involving Maxwell’s equations in isotropic media. IEEE Trans AntennasPropog, 1966, 14: 302-308302
[15]
15 Shadrivov I V, Sukhorukov A A, Kivshar Y S, et al. Nonlinear surface waves in left-handed materials. Phys Rev E, 2004, 69: 016617-016619016617？？
[16]
16 Grbic A, Eleftheriades G V. Overcoming the diffraction limit with a planar left-handed transmission-line lens. Phys Rev Lett, 2004, 92:117403.117406？？
