Abstract

For more than ten years now, significant effort has been focused on the engineering of metamaterials to achieve artificial optical magnetism, most notably for applications in negative refractive media. However, the challenges associated with the fact that the metals conventionally employed as the foundation of photonic metamaterials suffer from high inherent energy dissipation due to resistive losses remain. It has been shown recently that dielectric structures can provide optical magnetic responses based on Mie/cavity resonances [1] and here we experimentally demonstrate that near-infrared magnetic resonances, analogous to the 'trapped mode' response familiar to metallic asymmetric split rings [2], can be realized in all-dielectric metamaterials via coupling between pairs of closely spaced, geometrically dissimilar nano-bars.

© 2013 IEEE

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