Disorder effects of left-handed metamaterials with unitary dendritic structure cell

We demonstrate that the left-handed materials (LHMs) with unity dendritic unit cells arrayed in disorder state present still passband and negative refractive. The resonance behavior of LHMs in disturbed periodic lattice, quasi-periodic lattice and random array are experimentally investigated. Employing amended retrieval method, the LHMs with disordered state exhibits a negative index of refraction. Basing on such LHMs lens, the subwavelength imaging experiment give a clearly point image with a full wave at half maximum width of 0.4 lambda at 9.3 GHz. Similarly, the power field distribution of N shaped antenna is measured beyond the diffraction limit. (C) 2008 Optical Society of America.