Abstract

Specially designed metal–dielectric composites can have a negative refractive index in the optical range. Specifically, it is shown that arrays of single and paired nanorods can provide such negative refraction. For pairs of metal rods, a negative refractive index has been observed at 1.5μm. The inverted structure of paired voids in metal films can also exhibit a negative refractive index. A similar effect can be accomplished with metal strips in which the refractive index can reach 2. The refractive index retrieval procedure and the critical role of light phases in determining the refractive index are discussed.

© 2006 Optical Society of America

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