This kaleidoscope of colour is a hologram reflecting off tiny nanotubes of carbon. "You can create a hologram in any pattern you desire," says Tim Butler, the electrical engineer at the University of Cambridge who created this DayGlo simulation.
The light pattern is made using graphite cylinders, nested within one another. These nanotubes, about 100nm in diameter and about ten micrometres tall, are grown vertically on a silicon base in a specific pattern. Once you've got the shape you want, a laser (a five-milliwatt green laser, in this case) is shone on to the array of nanotubes and the light scatters, producing a hologram. This image can be projected on to any surface.
By: Madhumita Venkataramanan, Edited by: David Cornish
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via Wired.co.uk
http://www.wired.co.uk/magazine/archive/2013/02/start/holograms-take-on-crime-and-bacteria
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