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US 2020/0025975 A1Published application
Angle multiplexed metasurfaces
AssigneeCalifornia Institute of Technology
InventorsSeyedeh Mahsa KAMALI, Ehsan ARBABI, Amir ARBABI, Yu HORIE, MohammadSadegh FARAJI-DANA, Andrei FARAON
Life of this patent
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Abstract
A metasurface is defined by an array of scattering elements having a U shape, where the geometrical dimensions determining the U shape are determined according to the different phase profiles that the metasurface is meant to generate in response to an incident electromagnetic wave. The metasurface, therefore, generates different phase shifts as a function of the incident electromagnetic wave.
Claims19
A metasurface comprising:
- a metallic reflector;
- a spacer layer on the metallic reflector;
- and
- an array of scattering elements on the spacer layer, each scattering element of the array of scattering element having a height, and a U cross section defined by four cross section dimensions,
- wherein:
- the four cross section dimensions are Dx, Dy, Dxin, and Dyin,
- at least one scattering element of the array of scattering elements has a different value than at least one other scattering element of the array of scattering elements, for at least one of Dx, Dy, Dxin, and Dyin,
- the height and Dx, Dy, Dxin, and Dyin for each scattering element of the array of scattering elements are selected so that a first electromagnetic wave incident at a first angle to the metasurface is reflected with a first phase shift, and a second electromagnetic wave incident at a second angle to the metasurface is reflected with a second phase shift,
- the first angle is different from the second angle, and
- the first phase shift is different from the second phase shift.
7 more elements
A metasurface comprising:
- a spacer layer;
- and
- an array of scattering elements on the spacer layer, each scattering element of the array of scattering element having a height, and a U cross section defined by four cross section dimensions,
- wherein:
- the four cross section dimensions are Dx, Dy, Dxin, and Dyin,
- at least one scattering element of the array of scattering elements has a different value of at least one of Dx, Dy, Dxin, and Dyin,
- the height and Dx, Dy, Dxin, and Dyin for each scattering element of the array of scattering elements are selected so that a first electromagnetic wave incident at a first angle to the metasurface is transmitted with a first phase shift, and a second electromagnetic wave incident at a second angle to the metasurface is transmitted with a second phase shift,
- the first angle is different from the second angle, and
- the first phase shift is different from the second phase shift.
6 more elements
A method comprising:
- for an array of scattering elements, each scattering element of the array of scattering element having a height, and a U cross section defined by four cross section dimensions, calculating values of the height and of the four cross section dimensions generating a first phase shift and a second phase shift;
- and
- fabricating a metasurface comprising the array of scattering elements, based on the calculated values of the height of the four cross section dimensions, so that a first electromagnetic wave incident at a first angle to the metasurface is reflected with the first phase shift, and a second electromagnetic wave incident at a second angle to the metasurface is reflected with the second phase shift,
- wherein:
- the four cross section dimensions are Dx, Dy, Dxin, and Dyin,
- at least one scattering element of the array of scattering elements has a different value than at least one other scattering element of the array of scattering elements, for at least one of Dx, Dy, Dxin, and Dyin,
- the first angle is different from the second angle, and
- the first phase shift is different from the second phase shift.
5 more elements
Dependencies are inferred from the claim text.