Science· 2014Q1
Dielectric gradient metasurface optical elements
- 2,348citations
- Q1SCImago
- 2014year
Short summary
Dielectric gradient metasurfaces, fabricated from Si nanobeams, achieve high diffraction efficiencies in transmission mode in the visible spectrum, overcoming limitations of previous nanometallic designs.
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Key points
- Dielectric gradient metasurfaces were experimentally realized using 100-nm-thick Si nanobeam antennas.
- These metasurfaces achieve high diffraction efficiencies in transmission mode for visible light.
- Previous gradient metasurfaces were limited to reflection mode and nanometallic designs.
- Semiconductor materials enable easier integration with electronics and utilize mature fabrication technologies.
AI-generated from the title and abstract; the full text is not read.
Abstract
Gradient metasurfaces are two-dimensional optical elements capable of manipulating light by imparting local, space-variant phase changes on an incident electromagnetic wave. These surfaces have thus far been constructed from nanometallic optical antennas, and high diffraction efficiencies have been limited to operation in reflection mode. We describe the experimental realization and operation of dielectric gradient metasurface optical elements capable of also achieving high efficiencies in transmission mode in the visible spectrum. Ultrathin gratings, lenses, and axicons have been realized by patterning a 100-nanometer-thick Si layer into a dense arrangement of Si nanobeam antennas. The use of semiconductors can broaden the general applicability of gradient metasurfaces, as they offer facile integration with electronics and can be realized by mature semiconductor fabrication technologies.
The authors' abstract, as published at the source. Science, 2014 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science