Single-step manufacturing of hierarchical dielectric metalens in the visible

Gwanho Yoon, Kwan Kim, Daihong Huh, Heon Lee () and Junsuk Rho ()
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Gwanho Yoon: Pohang University of Science and Technology (POSTECH)
Kwan Kim: Korea University
Daihong Huh: Korea University
Heon Lee: Korea University
Junsuk Rho: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Metalenses have shown a number of promising functionalities that are comparable with conventional refractive lenses. However, current metalenses are still far from commercialization due to the formidable fabrication costs. Here, we demonstrate a low-cost dielectric metalens that works in the visible spectrum. The material of the metalens consists of a matrix-inclusion composite in which a hierarchy satisfies two requirements for the single-step fabrication; a high refractive index and a pattern-transfer capability. We use a UV-curable resin as a matrix to enable direct pattern replication by the composite, and titanium dioxide nanoparticles as inclusions to increase the refractive index of the composite. Therefore, such a dielectric metalens can be fabricated with a single step of UV nanoimprint lithography. An experimental demonstration of the nanoparticle composite-based metalens validates the feasibility of our approach and capability for future applications. Our method allows rapid replication of metalenses repeatedly and thereby provides an advance toward the use of metalenses on a commercial scale.

Date: 2020
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DOI: 10.1038/s41467-020-16136-5

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