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Proposed mechanism to enhance optical gradient forces between two dielectric slab waveguides. A metamaterial cladding indicated by split-ring resonators is derived from a folded coordinate transformation to reduce the distance between the two waveguides (shown in plain gray) perceived by light. Selected for an Editors' Suggestion and a Synopsis in Physics. [Vincent Ginis, Philippe Tassin, Costas M. Soukoulis, and Irina Veretennicoff, Phys. Rev. Lett. 110, 057401 (2013)]

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