期刊
NANO LETTERS
卷 18, 期 12, 页码 7801-7808出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03567
关键词
Metasurface; achromatic metalens; dispersion engineering; polarization-insensitive; visible spectrum; titanium dioxide
类别
资金
- Air Force Office of Scientific Research (MURI) [FA9550-14-1-0389, FA9550-16-1-0156]
- National Science Foundation under NSF [1541959]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP award) [NRF-CRP15-2015-03]
Existing methods of correcting 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 meta surface lenses have been demonstrated but are limited to diameters on the order of 100 mu cm due to the large required group delays. Here, we circumvent this limitation and design a metacorrector by combining a tunable phase and artificial dispersion to correct spherical and chromatic aberrations in a large spherical plano-convex lens. The tunability results from a variation in light confinement in sub-wavelength waveguides by locally tailoring the effective refractive index. The effectiveness of this approach is further validated by designing a metacorrector, which greatly increases the of a state-of-the-art immersion objective (composed of 14 lenses and 7 types of glasses) from violet to near-infrared wavelengths. This concept of hybrid metasurface-refractive optics combines the advantages of both technologies in terms of size, scalability, complexity, and functionality.
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