OPTICAL ELEMENT WITH DIFFRACTIVE FOCUSING FEATURES AND DIFFRACTIVE ANTI-REFLECTION FEATURES
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United States of America Patent
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Issued Date -
Jul 4, 2024
app pub date -
Mar 14, 2024
filing date -
Nov 26, 2019
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Abstract
In an optical element, diffractive focusing features and diffractive anti-reflection features can extend into a first surface of a body, such as by etching. The diffractive focusing features can have a same first depth that is greater than a wavelength, and can be located in a first area to have a duty cycle that varies over the first area. The diffractive anti-reflection features can have a same second depth that is less than the wavelength. In some examples, an effective refractive index of the diffractive focusing features and the diffractive anti-reflection features, together, can be less than or equal to a specified value, such as 120% of a square root of a refractive index of a material of the body. In other examples, the diffractive anti-reflection features can be located in the first area to have a duty cycle that is constant over the first area.
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