OPTICAL ELEMENT, LIGHTING APPARATUS AND SOLAR CELL DEVICE
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United States of America Patent
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Mar 18, 2021
app pub date -
Feb 28, 2020
filing date -
Sep 18, 2019
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According to one embodiment, an optical element includes a continuous gradient index distribution area, and a first medium. The continuous gradient index distribution area is configured to continuously attenuate gradient index from a center of the optical element in a radial direction. The first medium is at the center. The first medium includes an area where absolute value of imaginary part of a complex refractive index is greater than zero.
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