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How To Make Colour With Holes

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Light is a form of electromagnetic radiation, but how can we create light with holes and 3-dimensional formations? Nature does that and now scientists are trying to control that process too, in order to create banknotes and tickets that are almost impossible to forge.

Soon these nanoscale security devices could replace holograms. They are many times more reflective than holograms, and although the structures are smaller scale, they are lower aspect ratio and therefore easy to manufacture in bulk.

Creator: Veritasium

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