Rainbow Trapped for First Time, Using Convex Lens and Glass [Optical Computing]
And pretty on the inside.
University professors coated one side of a 4.5 millimetre diameter lens with a 30 nanometre thick coat of gold film, which they then put on a sheet of glass also splashed with a helping of gold. After shining a laser beam at the space between the curved lens and the glass, a rainbow appeared trapped between the elements when looked down on with a microscope. No pot of gold appeared, but a little dancing McNulty, dressed in a leprechaun costume, could be seen under the rainbow. [Arxiv via New Scientist]
Image credit Carla216
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