Report by photonics crystal pioneer John Joannopoulos and his group at MIT,
soon to be published in Physical Review Letters.

Researchers claim use of shock waves in photonic crystals will allow a way
to shift the frequency of light beams to any desired colour, with near 100
per cent efficiency.

If the effect can be harnessed, it will revolutionise a range of fields -
turning heat into light, for example, or prized terahertz rays.

         http://www.newscientist.com/news/news.jsp?id=ns99993750

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