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Related Experiment Video

Updated: Feb 2, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Broadband Achromatic Metasurface-Refractive Optics.

Wei Ting Chen¹, Alexander Y Zhu¹, Jared Sisler^1,2

¹Harvard John A. Paulson School of Engineering and Applied Sciences , Harvard University , Cambridge , Massachusetts 02138 , United States.

|November 14, 2018

Summary

Researchers developed a novel metacorrector to fix optical aberrations. This hybrid approach enhances lens bandwidth from violet to near-infrared, overcoming limitations of existing methods.

Keywords:

Metasurface achromatic metalens dispersion engineering polarization-insensitive titanium dioxide visible spectrum

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Area of Science:

Optics and Photonics
Metamaterials Science

Background:

Traditional chromatic aberration correction relies on material dispersion or diffractive elements.
Metasurface lenses offer broadband achromatic correction but are limited in size (approx. 100 μm) due to group delay requirements.

Purpose of the Study:

To design a metacorrector overcoming size limitations for correcting spherical and chromatic aberrations.
To combine metasurface tunability with refractive optics for enhanced optical system performance.

Main Methods:

Designed a metacorrector using tunable phase and artificial dispersion by altering light confinement in sub-wavelength waveguides.
Tailored the effective refractive index locally to achieve tunability.
Integrated the metacorrector with a large spherical plano-convex lens and a state-of-the-art immersion objective.

Main Results:

Successfully corrected spherical and chromatic aberrations in a large lens.
Significantly increased the operational bandwidth of a complex immersion objective from violet to near-infrared wavelengths.
Demonstrated a hybrid metasurface-refractive optics approach.

Conclusions:

The developed metacorrector effectively addresses limitations of existing aberration correction techniques.
Hybrid metasurface-refractive optics offer advantages in size, scalability, complexity, and functionality for optical systems.
This approach paves the way for advanced optical designs with extended spectral performance.