Abstract
Current metalenses with large numerical apertures suffer from low efficiency. In this paper, we demonstrate a refractive-meta hybrid system consisting of a ball lens mainly providing the ray bending ability, and a meta-corrector to eliminate aberration of the optical system. Spatial frequency requirement of the meta-device is significantly reduced since system ray bending ability is mainly provided by refractive element. As a result, a large pixel liquid crystal spatial light modulator is sufficient to demonstrate the concept of meta-corrector for the refractive-meta hybrid system with a numerical aperture of 0.52. It is shown that the focal spot size can be significantly reduced from 322.07 m to 0.636 m for ray-tracing simulation, and 101.6 m to 7.7 m for measurement, as an appropriate phase distribution of the meta-corrector is added. We believe this pilot experiment can be applied to ball lenses and other optical lens-sets like cookie triplets as well.
Original language | English |
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Pages (from-to) | 6880-6885 |
Number of pages | 6 |
Journal | Journal of Lightwave Technology |
Volume | 39 |
Issue number | 21 |
DOIs | |
State | Published - Nov 2021 |
Keywords
- aberration
- Diffraction
- Lenses
- Meta-corrector
- Metasurfaces
- Nonlinear optics
- Optical device fabrication
- Optical modulation
- Optical refraction
- refractive-meta hybrid system
- SLM