Ultrawide-angle and high-efficiency metalens in hexagonal arrangement
Autor: | Chun-Yuan Fan, Chia-Ping Lin, Guo-Dung John Su |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Diffraction
Image quality lcsh:Medicine 02 engineering and technology 01 natural sciences Article 010309 optics Image stitching Optics Optical physics 0103 physical sciences Single lens Optical materials and structures lcsh:Science Physics Multidisciplinary Hexagonal crystal system business.industry lcsh:R 021001 nanoscience & nanotechnology Polarization (waves) Numerical aperture Wavelength Optics and photonics lcsh:Q 0210 nano-technology business |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | Wide-angle optical systems play a vital role in imaging applications and have been researched for many years. In traditional lenses, attaining a wide field of view (FOV) by using a single optical component is difficult because these lenses have crucial aberrations. In this study, we developed a wide-angle metalens with a numerical aperture of 0.25 that provided a diffraction-limited FOV of over 170° for a wavelength of 532 nm without the need for image stitching or multiple lenses. The designed wide-angle metalens is free of aberration and polarization, and its full width of half maximum is close to the diffraction limit at all angles. Moreover, the metalens which is designed through a hexagonal arrangement exhibits higher focusing efficiency at all angles than most-seen square arrangement. The focusing efficiencies are as high as 82% at a normal incident and 45% at an incident of 85°. Compared with traditional optical components, the proposed metalens exhibits higher FOV and provides a more satisfactory image quality because of aberration correction. Because of the advantages of the proposed metalens, which are difficult to achieve for a traditional single lens, it has the potential to be applied in camera systems and virtual and augmented reality. |
Databáze: | OpenAIRE |
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