Metasurfaces with asymetric gratings for redirecting light and methods for fabricating
An optical system comprises an optically transmissive substrate comprising a metasurface which comprises a grating comprising a plurality of unit cells. Each unit cell comprises a laterally-elongated first nanobeam having a first width; and a laterally-elongated second nanobeam spaced apart from the...
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Main Authors | , , , , |
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Format | Patent |
Language | Chinese English |
Published |
01.12.2017
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Subjects | |
Online Access | Get full text |
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Summary: | An optical system comprises an optically transmissive substrate comprising a metasurface which comprises a grating comprising a plurality of unit cells. Each unit cell comprises a laterally-elongated first nanobeam having a first width; and a laterally-elongated second nanobeam spaced apart from the first nanobeam by a gap, the second nanobeam having a second width larger than the first width. A pitch of the unit cells is 10 nm to 1 [mu]m. The heights of the first and the second nanobeams are: 10 nm to 450 nm where a refractive index of the substrate is more than 3.3; and 10 nm to 1 [mu]m where the refractive index is 3.3 or less. |
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Bibliography: | Application Number: TW20176115207 |