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Ultra-wide continuous zoom imaging system based on an Alvarez-Moiré metalens
Applied Optics
|August 13, 2026
Summary
This study introduces a novel Alvarez-Moiré metalens system for continuous zoom imaging. By rotating metasurface phase plates, it achieves focal length adjustment without aperture reduction or off-axis aberrations, enabling compact imaging devices.
Area of Science:
- Optics and Photonics
- Metamaterials
- Optical Engineering
Background:
- Traditional Alvarez lenses use lateral displacement, leading to smaller apertures and aberrations.
- Continuous zoom imaging systems require compact designs with high optical quality.
Purpose of the Study:
- To design and construct an annular-array Alvarez-Moiré metalens system for continuous zoom imaging.
- To overcome the limitations of traditional Alvarez lenses, such as reduced aperture and off-axis aberrations.
Main Methods:
- Utilized moiré rotational focusing with two cascaded metasurface phase plates.
- Employed TiO2 cylindrical nanostructures on a SiO2 substrate for metasurface phase modulation.
- Integrated an annular array of eight Alvarez-Moiré metalens sub-lenses with a meniscus lens.
Main Results:
- Achieved continuous focal-length adjustment of ±500mm through relative rotation.
- Verified continuous zoom imaging capability with USAF 1951 resolution target experiments.
- Maintained a Strehl ratio >0.9, indicating near-diffraction-limited focusing performance.
Conclusions:
- The Alvarez-Moiré metalens system offers continuous zoom capability with high focusing quality.
- The design overcomes traditional Alvarez lens limitations, enabling compact integrated zoom imaging devices.
