All-dielectric optical diffractive pigments
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United States of America Patent
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Nov 9, 2004
Grant Date -
Dec 4, 2003
app pub date -
Feb 11, 2003
filing date -
May 31, 2002
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Abstract
All-dielectric diffractive pigment flakes can be applied to an object to impart a diffractive effect to the object without substantially changing the background color of the object. In one case, such diffractive pigment flakes can be applied to a white object to impart a white diffractive effect. The thickness of the dielectric layers in the diffractive pigment flakes can be chosen to provide thin-film interference, as well as diffraction from the interfaces between layers patterned with a diffraction grating. In some cases, the thin-film interference can provide color shifting in addition to the diffractive effect.
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