Directional Color Filter (IMAGE)

National Institute of Standards and Technology (NIST)

Directional Color Filter

Caption

Schematic shows two different ways that white light interacts with a newly developed device, a directional color filter ruled with grooves that are not uniformly spaced. When white light illuminates the patterned side of the compact metal device at three different angles -- in this case, 0° degrees, 10° and 20° -- the device transmits light at red, green and blue wavelengths, respectively. When white light incident at any angle illuminates the device from the non-patterned side, it separates the light into the same three colors, and sends off each color in different directions corresponding to the same respective angles.

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NIST

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