Coaxial cables transmit radiation with a wavelength much bigger than their diameter. Now, a miniature version borrows this concept to carry visible light at the nanoscale.
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Thio, T. Coaxing light into small spaces. Nature Nanotech 2, 136–138 (2007). https://doi.org/10.1038/nnano.2007.53
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DOI: https://doi.org/10.1038/nnano.2007.53
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