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Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

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Varifocal Alvarez metalens array for adaptive light-field imaging.

Xiaoyu Che^1,2, Xiaoyuan Liu¹, Xin Zhang³

¹Department of Electrical Engineering and State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong SAR, China.

Nature Communications

|June 23, 2026

Summary

This summary is machine-generated.

Adaptive light-field imaging is now possible using a novel varifocal Alvarez metalens array. This technology enables dynamic focusing and enhanced depth range for compact imaging systems.

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Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging

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Published on: April 11, 2025

Area of Science:

Optics and Photonics
Metasurfaces
Computational Imaging

Background:

Metalens arrays offer compact solutions for light-field imaging.
Fixed focal lengths of traditional metalenses limit adaptability and depth-of-field control.
Achieving dynamic focusing in compact imaging systems remains a challenge.

Purpose of the Study:

To demonstrate adaptive light-field imaging using a varifocal Alvarez metalens array.
To enable dynamic focusing and expand the depth range of plenoptic imaging systems.
To develop a method for reconstructing high-resolution, all-in-focus images from multi-focus captures.

Main Methods:

Fabrication of a varifocal Alvarez metalens array composed of two bonded metasurfaces with cubic-phase sub-regions.
Achieving continuous focal length tuning via relative lateral displacement of the metasurfaces.
Integration into a plenoptic imaging system and application of a MultiLensFusion algorithm for image reconstruction.

Main Results:

Demonstrated continuous focal length tuning from 3.33 mm to 4.50 mm.
Enabled dynamic focusing and expanded depth range in a light-field imaging system.
Successfully reconstructed high-resolution, all-in-focus images using the MultiLensFusion algorithm.

Conclusions:

The varifocal Alvarez metalens array provides a compact and versatile platform for adaptive light-field imaging.
This technology overcomes the limitations of fixed focal lengths in metalens-based systems.
Offers a pathway for next-generation imaging systems with tunable optical responses.