Anti-reflection structure with graded refractive index layer and optical apparatus including same
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United States of America Patent
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Mar 22, 2016
Grant Date -
Oct 6, 2011
app pub date -
Apr 1, 2011
filing date -
Apr 1, 2010
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Abstract
The anti-reflection structure includes a graded refractive index layer that is disposed on a substrate and whose refractive index decreases as a distance from the substrate increases, and a homogeneous layer that is disposed on the graded refractive index layer and whose refractive index is homogeneous. The structure satisfies a condition of nb−na>0.10 where na represents the refractive index of the homogenous layer, and nb represents a homogenous layer side effective refractive index of the graded index refractive index layer.
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