Negative indices of refraction are a hot topic these days, with applications to exotic optics such as "superlenses" and forms of "invisibility". Practical work, however, has been limited to the microwave region because of the difficulty in fabricating the tiny elements required. Now Uday Chettiar and colleagues at Purdue University in Indiana may have made a breakthrough. They report simulations of designs for materials made from metallic nanostrips separated by a dielectric layer.
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