Broadband high-efficiency dielectric metasurfaces for the visible spectrum
Metasurfaces are planar optical elements that hold promise for overcoming the limitations of refractive and conventional diffractive optics. Original dielectric metasurfaces are limited to transparency windows at infrared wavelengths because of significant optical absorption and loss at visible wave...
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Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2016-09, Vol.113 (38), p.10473-10478 |
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creator | Devlin, Robert C. Khorasaninejad, Mohammadreza Chen, Wei Ting Oh, Jaewon Capasso, Federico |
description | Metasurfaces are planar optical elements that hold promise for overcoming the limitations of refractive and conventional diffractive optics. Original dielectric metasurfaces are limited to transparency windows at infrared wavelengths because of significant optical absorption and loss at visible wavelengths. Thus, it is critical that new materials and nanofabrication techniques be developed to extend dielectric metasurfaces across the visible spectrum and to enable applications such as high numerical aperture lenses, color holograms, and wearable optics. Here, we demonstrate high performance dielectric metasurfaces in the form of holograms for red, green, and blue wavelengths with record absolute efficiency (>78%). We use atomic layer deposition of amorphous titanium dioxide with surface roughness less than 1 nmand negligible optical loss. We use a process for fabricating dielectric metasurfaces that allows us to produce anisotropic, subwavelength-spaced dielectric nanostructures with shape birefringence. This process is capable of realizing any high-efficiency metasurface optical element, e.g., metalenses and axicons. |
doi_str_mv | 10.1073/pnas.1611740113 |
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subjects | Anisotropy Broadband Dielectric properties Holography Optics Physical Sciences Spectrum analysis Surface roughness |
title | Broadband high-efficiency dielectric metasurfaces for the visible spectrum |
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