STRUCTURED COLOR FILTER DEVICE
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United States of America Patent
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Issued Date -
Apr 17, 2014
app pub date -
Oct 15, 2013
filing date -
Oct 15, 2012
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Abandoned
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Abstract
A structured color filtering device includes one or more unit cells. Each unit cell includes a substrate having a surface with a step function surface profile having two or more discrete levels formed therein. The step function surface profile forms in the surface a plurality of grooves arranged in a fundamentally symmetric pattern having a periodic groove pitch. When ordinary light is incident on the surface, the surface is structured to diffract light having a predetermined wavelength toward observation points at all polar angles above the surface greater than a predetermined incident angle.
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