Broadband achromatic dielectric metalenses

Shrestha, Sajan; Overvig, Adam C.; Lu, Ming; Stein, Aaron; Yu, Nanfang

doi:10.1038/s41377-018-0078-x

Title: Broadband achromatic dielectric metalenses

Journal Article · Wed Nov 07 00:00:00 EST 2018 · Light, Science & Applications

DOI:https://doi.org/10.1038/s41377-018-0078-x· OSTI ID:1619560

Shrestha, Sajan; Overvig, Adam C.;

; Stein, Aaron; Yu, Nanfang

Abstract Metasurfaces offer a unique platform to precisely control optical wavefronts and enable the realization of flat lenses, or metalenses, which have the potential to substantially reduce the size and complexity of imaging systems and to realize new imaging modalities. However, it is a major challenge to create achromatic metalenses that produce a single focal length over a broad wavelength range because of the difficulty in simultaneously engineering phase profiles at distinct wavelengths on a single metasurface. For practical applications, there is a further challenge to create broadband achromatic metalenses that work in the transmission mode for incident light waves with any arbitrary polarization state. We developed a design methodology and created libraries of meta-units—building blocks of metasurfaces—with complex cross-sectional geometries to provide diverse phase dispersions (phase as a function of wavelength), which is crucial for creating broadband achromatic metalenses. We elucidated the fundamental limitations of achromatic metalens performance by deriving mathematical equations that govern the tradeoffs between phase dispersion and achievable lens parameters, including the lens diameter, numerical aperture (NA), and bandwidth of achromatic operation. We experimentally demonstrated several dielectric achromatic metalenses reaching the fundamental limitations. These metalenses work in the transmission mode with polarization-independent focusing efficiencies up to 50% and continuously provide a near-constant focal length over λ = 1200–1650 nm. These unprecedented properties represent a major advance compared to the state of the art and a major step toward practical implementations of metalenses.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1619560

Alternate ID(s):: OSTI ID: 1487249

Report Number(s):: BNL-209750-2018-JAAM; 85; PII: 78

Journal Information:: Light, Science & Applications, Journal Name: Light, Science & Applications Vol. 7 Journal Issue: 1; ISSN 2047-7538

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 376 works

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