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Phys Rev Lett. 2007 Oct 5;99(14):147401. Epub 2007 Oct 2.

Sharp trapped-mode resonances in planar metamaterials with a broken structural symmetry.

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Optoelectronics Research Centre, University of Southampton, UK.

Abstract

We report that a resonance response with a very high quality factor can be achieved in a planar metamaterial by introducing symmetry breaking in the shape of its structural elements, which enables excitation of trapped modes, i.e., modes that are weakly coupled to free space.

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