Abstract
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 them. The holes act to improve the confinement of the radiation in the fibre, and can also be designed to modify the light wave in a variety of ways. These holey fibres are an example of a photonic crystal, an assembly of …
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