1. Stefan A. Maier is in the Experimental Solid State Group, Physics Department, Imperial College, London SW7 2AZ, UK.
   e-mail: S.Maier@imperial.ac.uk

Abstract

Waveguides are crucial for directing light, but truly useful waveguides should confine light on the nanoscale. Researchers show that a semiconducting nanowire close to a metallic surface can confine light far below the diffraction limit and guide it over dozens of wavelengths.

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