True Color 3-D Hologram

Holograms are pretty cool, but they're lacking in the color department. Well, not for long, perhaps. Photonics physicists from Osaka University in Japan have managed to capture the original colors of an object in 3-D holograms:

The team at Osaka took another approach, they use both lasers and white light. They first fire a laser at an object, say an apple, to create an interference pattern, but instead of just one laser color, they actually use three; red, green and blue.

The interference pattern is then captured on a light sensitive material which is coated with silver (because it contains electrons that are easily excited by white light) and silicon dioxide (to help steer the waves).

They then shine a steady white light on the metal sheathed material exciting the free electrons, causing the creation of surface plasmons, which results in the regeneration of the captured image as a true-color 3-D hologram; one that can be viewed from almost any angle and is the same colors as the original object.


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