Criteria for negative refraction in active and passive media

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Abstract

We review three commonly used conditions that characterize negative refraction in isotropic dielectric-magnetic materials. We show that while all the different conditions are equivalent for passive media, they are distinct for different types of active media. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1804–1807, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23489

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