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- W2275877522 abstract "Reflective gradient metasurfaces are reported as flat, ultra-thin light focusers using a cross-resonator array with spatially varied geometric parameters atop a continuous gold ground plane spaced by a layer of SiO2. The sub-wavelength cross-shaped building element offers polarization-independent performance and full 2π phase tuning range by varying its width and length, which is explained by an analytical model based on harmonically oscillating dipole antenna. With a radial phase gradient, a metasurface is demonstrated to function as a parabolic reflector at 1.47 μm wavelength with the measured efficiency of 44%. In addition, by elaborately engineering the planar distribution of different building elements, another two focusing reflectors are designed and experimentally verified to anomalously reflect and concentrate light along normal direction but with oblique incident angles of 30° and 60°, respectively." @default.
- W2275877522 created "2016-06-24" @default.
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- W2275877522 date "2016-02-15" @default.
- W2275877522 modified "2023-10-16" @default.
- W2275877522 title "Reflective gradient metasurfaces for polarization-independent light focusing at normal or oblique incidence" @default.
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- W2275877522 doi "https://doi.org/10.1063/1.4942465" @default.
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