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A hybrid achromatic metalens.

F Balli¹, M Sultan², Sarah K Lami³

¹Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA. fatih.balli@uky.edu.

Nature Communications

|August 6, 2020

Summary

Researchers developed a Hybrid Achromatic Metalens (HAML) that overcomes chromatic aberration while maintaining high focusing efficiency. This new metalens design offers improved performance across a broad wavelength range, paving the way for advanced optical applications.

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Area of Science:

Optics and Photonics
Nanotechnology
Materials Science

Background:

Metalenses are ultra-thin optical elements utilizing subwavelength structures for light manipulation.
Traditional metalenses correcting chromatic aberration often exhibit reduced focusing efficiency.
Existing metalenses offer advantages in size, weight, and functionality like polarization control.

Purpose of the Study:

To introduce a novel Hybrid Achromatic Metalens (HAML) design.
To overcome the trade-off between chromatic aberration correction and focusing efficiency in metalenses.
To achieve high focusing efficiency over a broad wavelength range (1000-1800 nm).

Main Methods:

Developed a design methodology combining recursive ray-tracing and simulated phase libraries.
Avoided computationally intensive global search algorithms for metalens design.
Fabricated HAMLs using multi-photon lithography for customization and molding for mass production in low-refractive index materials.

Main Results:

Achieved diffraction-limited performance for numerical apertures of 0.27, 0.11, and 0.06.
Demonstrated average focusing efficiencies greater than 60%, with maximum efficiencies reaching 80%.
Introduced an air-spaced HAML design for larger diameters and numerical apertures.

Conclusions:

The Hybrid Achromatic Metalens (HAML) effectively corrects chromatic aberration with high focusing efficiency.
HAMLs offer a viable solution for advanced optical systems requiring compact and efficient achromatic focusing.
The fabrication methods allow for both customized and mass-produced metalens solutions.