Contains the keyword negative refraction

Zhou JF, Chowdhury DR, Zhao RK, Azad AK, Chen HT, Soukoulis CM, et al. Terahertz chiral metamaterials with giant and dynamically tunable optical activity. Phys Rev B. 2012;86:035448. Abstract

Vasilantonakis N, Terzaki K, Sakellari I, Purlys V, Gray D, Soukoulis CM, et al. Three-Dimensional Metallic Photonic Crystals with Optical Bandgaps. Adv Mater. 2012;24:1101-5.

Zhao RK, Koschny T, Soukoulis CM. Chiral metamaterials: retrieval of the effective parameters with and without substrate. Optics Express. 2010;18:14553-67. Abstract

Wang BN, Zhou JF, Koschny T, Kafesaki M, Soukoulis CM. Chiral metamaterials: simulations and experiments. Journal of Optics a-Pure and Applied Optics. 2009;11:114003. Abstract

Foteinopoulou S, Kafesaki M, Economou EN, Soukoulis CM. Backward surface waves at photonic crystals. Phys Rev B. 2007;75:245116. Abstract

Foteinopoulou S, Kenanakis G, Katsarakis N, Tsiapa I, Kafesaki M, Economou EN, et al. Experimental verification of backward wave propagation at photonic crystal surfaces. Appl Phys Lett. 2007;91:214102. Abstract

Guven K, Cakmak AO, Caliskan MD, Gundogdu TF, Kafesaki M, Soukoulis CM, et al. Bilayer metamaterial: analysis of left-handed transmission and retrieval of effective medium parameters. J Opt A-Pure Appl Opt. 2007;9:S361-S365. Abstract

Ricci MC, Xu H, Prozorov R, Zhuravel AP, Ustinov AV, Anlage SM. Tunability of superconducting metamaterials. IEEE Trans Appl Supercond. 2007;17:918-21. Abstract