Experimental demonstration of a structured material with extreme effective parameters at microwaves

Following our recent theoretical studies [M. G. Silveirinha and C. A. Fernandes, Phys. Rev. B 78, 033108 (2008)], it is experimentally verified that an array of crossed metallic wires may behave as a nonresonant material with extremely large index of refraction at microwaves and may enable the realization of ultrasubwavelength waveguides. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3012373]