Japanese scientists have created a device that could revolutionise optical communications by paving the way for all-optical circuits. Susumu Noda and co-workers at Kyoto University modified a photonic-crystal structure so that it could add or drop photons of selected energies to streams of optical data. The team believes this is the first time that a single defect has been used to trap and re-emit photons (S Noda et al 2000 Nature 407 608).
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