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10× continuous optical zoom imaging using Alvarez lenses actuated by dielectric elastomers
Optics Express
|February 1, 2024
Summary
This study introduces a novel continuous optical zoom system using Alvarez lenses actuated by dielectric elastomers. This innovation enables a 10x zoom ratio with high resolution for advanced imaging applications.
Area of Science:
- Optics and Photonics
- Imaging Systems Engineering
Background:
- Continuous optical zoom is crucial for various imaging applications but often limited by discrete zoom rates or narrow ranges.
- Existing optical zoom systems face challenges in achieving wide zoom ranges and smooth magnification changes.
Purpose of the Study:
- To propose and validate a continuous optical zoom imaging system with a wide zoom range.
- To overcome the limitations of discrete zoom rates in conventional optical zoom systems.
Main Methods:
- The system utilizes a solid lens, two Alvarez lenses composed of cubic phase plates with inverted freeform surfaces, and a camera.
- Dielectric elastomer actuation enables lateral movement of the cubic phase masks, altering Alvarez lens focal lengths for magnification tuning.
- The system's continuous optical zoom capability is experimentally verified.
Main Results:
- Achieved a zoom ratio of up to 10x, with magnification continuously varying from 1.58x to 15.80x.
- Demonstrated rapid response times of 150 ms (rise) and 210 ms (fall).
- Maintained imaging resolution up to 114 line pairs/mm during the zoom process.
Conclusions:
- The developed continuous optical zoom system offers a wide zoom range and high resolution.
- The system's performance validates its potential for applications in microscopy, biomedicine, and virtual reality.
