Journal
NANO LETTERS
Volume 18, Issue 12, Pages 7529-7537Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03017
Keywords
Multiwavelength metalens; polarization-insensitive; metasurface doublet; spectrum splitter
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Funding
- National Science Foundation (NSF) [ECCS-1351334, DMR-1410940]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410940] Funding Source: National Science Foundation
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Metasurfaces provide a versatile platform for manipulating the wavefront of light using planar nanostructured surfaces. Transmissive metasurfaces, with full 2 pi phase control, are a particularly attractive platform for replacing conventional optical elements due to their small footprint and broad functionality. However, the operational bandwidth of metasurfaces has been a critical limitation and is directly connected to either their resonant response or the diffractive dispersion of their lattice. While multiwavelength and continuous band operation have been demonstrated, the elements suffer from either low efficiency, reduced imaging quality, or limited element size. Here, we propose a platform that provides for multiwavelength operation by employing tightly spaced multilayer dielectric metasurfaces. As a proof of concept, we demonstrate a multiwavelength metalens doublet (NA = 0.42) with focusing efficiencies of 38% and 52% at wavelengths of 1180 and 1680 nm, respectively. We further show how this approach can be extended to three-wavelength metalenses as well as a spectral splitter. This approach could find applications in fluorescent microscopy, digital imaging, and color routing.
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