Refractive and Meta-Optics Hybrid System

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 requir...

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Bibliographic Details
Published in:Journal of lightwave technology 2021-11, Vol.39 (21), p.6880-6885
Main Authors: Liu, Guang-Yan, Hsu, Wei-Lun, Pan, Jui-Wen, Wang, Chih-Ming
Format: Article
Language:English
Subjects:
Aberration
Bending machines
Diffraction
Hybrid systems
Lenses
Liquid crystals
meta-corrector
Metasurfaces
Nonlinear optics
Numerical aperture
Optical device fabrication
Optical modulation
Optical refraction
Phase distribution
Ray tracing
refractive-meta hybrid system
SLM
Spatial light modulators
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Summary: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 μm to 0.636 μm for ray-tracing simulation, and 101.6 μm to 7.7 μm 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.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2021.3106935