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Optics Letters

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  • Vol. 27, Iss. 11 — Jun. 1, 2002
  • pp: 885–887

Is there an experimental verification of a negative index of refraction yet?

N. Garcia and M. Nieto-Vesperinas  »View Author Affiliations


Optics Letters, Vol. 27, Issue 11, pp. 885-887 (2002)
http://dx.doi.org/10.1364/OL.27.000885


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Abstract

We show that recent claims of experimental verification of a negative index of refraction in metallic metamaterials, “left-handed” microwave frequencies, are questionable. At these frequencies the imaginary part of the dielectric permittivity is significant or even dominates its real part, and hence the effective medium behaves as a metal, i.e., with losses below the cutoff frequency of relevance. Then, the refractive index is complex, and there is not a distinction between right- and left-handed material because the electromagnetic wave is inhomogeneous. Just by using this idea we explain the transmittivities that were recently obtained in experiments by Shelby et al. [Science 292, 77 (2001) and Appl. Phys. Lett. 78, 489 (2001)].

© 2002 Optical Society of America

OCIS Codes
(000.2690) General : General physics
(260.2110) Physical optics : Electromagnetic optics

Citation
N. Garcia and M. Nieto-Vesperinas, "Is there an experimental verification of a negative index of refraction yet?," Opt. Lett. 27, 885-887 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-11-885

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