Q J Med 2003; 96: 783
© 2003 Association of Physicians
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Scanning near-field image of the wave front at the end of a holey fibre
Department of Chemistry University of Southampton
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Photograph by Jeremy Frey
Glass fibres as thin as a human hair now carry most of our long-distance telephone calls. To squeeze even more information down a fibre, new types have been developed that have holes with nothing but air inside