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Metasurface Freeform Nanophotonics.

Alan Zhan¹, Shane Colburn², Christopher M Dodson²

¹Department of Physics, University of Washington, Seattle, WA-98195, USA.

Scientific Reports

|May 12, 2017

Summary

Researchers designed novel metasurfaces to mimic complex freeform optics. This breakthrough enables miniaturized optical components with enhanced functionalities like extended depth of field and tunable lenses.

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Area of Science:

Nanophotonics
Optical Engineering

Background:

Freeform optics offer advanced capabilities but face manufacturing challenges at microscale.
Metasurfaces provide a planar alternative to mimic complex optical curvatures.

Purpose of the Study:

To develop a metasurface platform for designing freeform optical analogues.
To demonstrate the capabilities of metasurface-based freeform optics at visible wavelengths.

Main Methods:

Utilized a silicon nitride metasurface platform for visible light operation.
Designed and fabricated metasurface analogues of freeform optical elements.

Main Results:

Demonstrated a cubic phase plate with an enhanced depth of field (>300 µm).
Showcased an Alvarez lens with tunable focal length (~1600 D change over 100 µm displacement).

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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Last Updated: Mar 2, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

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Published on: September 11, 2018

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Conclusions:

Metasurface adaptation of freeform optics enables significant miniaturization.
This approach offers a scalable method for implementing arbitrary geometric curvatures in nanophotonics.