A hybrid achromatic metalens

Metalenses, ultra-thin optical elements that focus light using subwavelength structures, have been the subject of a number of recent investigations. Compared to their refractive counterparts, metalenses offer reduced size and weight, and new functionality such as polarization control. However, metal...

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Vydané v:Nature communications Ročník 11; číslo 1; s. 3892 - 8
Hlavní autori: Balli, F., Sultan, M., Lami, Sarah K., Hastings, J. T.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: London Nature Publishing Group UK 04.08.2020
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Aberration
Computer simulation
Diffraction
Direct laser writing
Efficiency
Humanities and Social Sciences
Mass production
multidisciplinary
Numerical aperture
Optical components
Phase plates
Ray tracing
Refractivity
Science
Science (multidisciplinary)
Search algorithms
Size reduction
Wavelength
ISSN:2041-1723, 2041-1723
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Shrnutí:Metalenses, ultra-thin optical elements that focus light using subwavelength structures, have been the subject of a number of recent investigations. Compared to their refractive counterparts, metalenses offer reduced size and weight, and new functionality such as polarization control. However, metalenses that correct chromatic aberration also suffer from markedly reduced focusing efficiency. Here we introduce a Hybrid Achromatic Metalens (HAML) that overcomes this trade-off and offers improved focusing efficiency over a broad wavelength range from 1000–1800 nm. HAMLs can be designed by combining recursive ray-tracing and simulated phase libraries rather than computationally intensive global search algorithms. Moreover, HAMLs can be fabricated in low-refractive index materials using multi-photon lithography for customization or using molding for mass production. HAMLs demonstrated diffraction limited performance for numerical apertures of 0.27, 0.11, and 0.06, with average focusing efficiencies greater than 60% and maximum efficiencies up to 80%. A more complex design, the air-spaced HAML, introduces a gap between elements to enable even larger diameters and numerical apertures. Metalenses that correct chromatic aberration also suffer from reduced focusing efficiency. Here, the authors introduce a Hybrid Achromatic Metalens which merges a metalens and phase plate to offer improved focusing efficiency over a broad wavelength range and diffraction limited imaging performance.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-17646-y