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Science 19 November 2004:
Vol. 306. no. 5700, p. 1255
DOI: 10.1126/science.306.5700.1255b
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This Week in Science

Metamaterials that are engineered to exhibit negative indices of refraction can provide a number of advantages in optics, such as the fabrication of a "perfect" lens, and much effort is being directed to push the frequencies at which negative indices can be achieved into the optical regime. Using nanofabrication techniques to shrink the dimensions of gold nanostructures making up the metamaterial, Linden et al. (p. 1351) show that the magnetic response can be raised to 100 terahertz. On the theoretical side, Pendry (p. 1353) introduces an alternate route to the design of metamaterials exhibiting negative refraction that may prove easier to prepare than the present structures, which are based on tuning the electric and magnetic response. The proposed structure relies on chirality and consists of a series of helically folded metallic foils. Designers should be able to work with the polarization of either the magnetic or the electric field, rather than both.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)