Among various flat optical devices, metasurfaces have presented their great ability in efficient manipulation of light fields and have been proposed for variety of devices with specific functionalities. However, due to the high phase dispersion of their
BROADBAND ACHROMATIC FLAT OPTICAL COMPONENTS BY DISPERSION-ENGINEERED DIELECTRIC METASURFACESTechniques for creating a replacement for optical elements with diffractive planar components based on metasurfaces are provided. In one example, a substantially flat optical component for lensing incoming electromagnetic...
Silicon that offers both high refractive index and mature nanofabrication technology, was shown to enable achromatic metalenses with efficiencies up to 50–60% in the spectral range from 1000 to 1800 nm (squares in Fig. 1)19. At shorter wavelengths above the band edge, the metasurfaces’ ...
Existing methods to correct for chromatic aberrations in optical systems are limited to two approaches: varying the material dispersion in refractive lenses, or incorporating grating dispersion via diffractive optical elements. Recently, single-layer broadband achromatic metasurface lenses have been demonstrated...
achromatic antennasbroadband dispersion engineeringfunctional metasurfacesGires–Tournois interferencesurface cloaksGeneralized law of refraction and reflection has enabled a tremendous amount of degrees of freedom for full vectorial electromagnetic manipulation with metasurfaces. However, owing to the fundamental...
we reveal a relationship between broadband achromatic functionality and element dispersion.All metasurface elements have anisotropic and asymmetric geometries with multiple scatterers and local cavities that synthetically support internal resonances,bi-anisotropy and multiple scattering for ultra-broadband customized...
Broadband achromatic dielectric metalenses 认领 被引量:55 引用 收藏 分享 摘要 Metasurfaces offer a unique platform to precisely control optical wavefronts and enable the realization of fla...展开更多 作者 Sajan Shrestha Adam C.Overvig Ming Lu Aaron Stein Nanfang Yu 机构地区 Department of Applied...
PDF:A broadband achromatic polarization-insensitive metalens consisting of anisotropic nanostructures Abstract Metasurfaces have attracted widespread attention due to an increasing demand of compact and wearable optical devices. For many applications, polarization-insensitive metasurfaces are highly desirable and ...
stacking or stitching several layers of metasurfaces 18 , increas-ing the phase modulation to be more than 2π radians (so-called multi-order diffractive lenses) 19 or engineering the dispersion 20–23 . Recently, achromatic focusing at green wavelengths (with a 60 nm bandwidth) in a reflectiv...
Broadband achromatic optical metasurface devices. Nat. Commun. 8, 187 (2017). Article Google Scholar Khorasaninejad, M. et al. Multispectral chiral imaging with a metalens. Nano Lett. 16, 4595–4600 (2016). Article Google Scholar Khorasaninejad, M., Ambrosio, A., Kanhaiya, P. & ...