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Varifocal Meta-Lens for Multifunctional Focusing and Imaging
Rong Lin1, Jin Yao1, Chen Chen1,2
1Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong, 999077, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 22, 2025
Summary
This study presents a polarization-independent varifocal meta-lens that switches between non-diffracting autofocusing and standard focusing beams. This compact optical system offers tunable beam control for advanced imaging applications.
Area of Science:
- Optics and Photonics
- Metamaterials
- Optical Engineering
Background:
- Achieving multifunctionality and tunability in compact optical systems is challenging.
- Conventional optics are bulky, and tunable metasurfaces have limited operational modes.
Purpose of the Study:
- To present a polarization-independent varifocal meta-lens enabling mode switching.
- To demonstrate continuous focal length modulation via a Moiré-based tuning mechanism.
Main Methods:
- Utilized two cascaded metasurfaces with a superimposed phase profile.
- Implemented a Moiré-based tuning mechanism for in-plane rotation.
- Analyzed mode transition via dual interpretation in real and spatial frequency domains.
Main Results:
- Achieved mode switching between abrupt autofocusing (AAF) and diffraction-limited focusing beams.
- Demonstrated focal length tuning ranges of 10.3 mm (AAF) and 29.3 mm (standard focusing).
- Enabled relative zoom magnification from 1× to 1.95× in standard focusing mode.
Conclusions:
- The proposed varifocal meta-lens offers a compact and tunable solution for beam control.
- This platform is suitable for adaptive imaging and optical microscopy.
- The device integrates multifunctionality and tunability for advanced optical systems.
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