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21 October 2024 Design of terahertz varifocal devices based on dielectric metasurface
Mingxuan Tan
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Proceedings Volume 13401, International Conference on Automation and Intelligent Technology (ICAIT 2024); 134010F (2024) https://doi.org/10.1117/12.3040444
Event: 2024 International Conference on Automation and Intelligent Technology (ICAIT 2024), 2024, Wuhan, China
Abstract
This paper presents the design of a rotational varifocal metasurface lens based on the principle of moiré lenses, utilizing square single-crystal silicon pillars. The metalens comprises two cascaded face-to-face metasurfaces, enabling focal length adjustment through the mutual rotation of these two metasurfaces. This design achieves high transmittance and complete 2π phase coverage. And through simulation verification, by rotating one layer of the metasurface from 60°, 72°, 90°, and 120°, the focal length of the designed moire metalens shifts from 5.68mm to 2.39mm along the -z direction on the xz plane, proving that the focus-shifted metalens we designed can be controlled by independently rotating the single-layer metasurface to adjust the focal length within the same focal plane.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Mingxuan Tan "Design of terahertz varifocal devices based on dielectric metasurface", Proc. SPIE 13401, International Conference on Automation and Intelligent Technology (ICAIT 2024), 134010F (21 October 2024); https://doi.org/10.1117/12.3040444
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KEYWORDS
Silicon
Design
Moire patterns
Dielectrics
Interfaces
Phase distribution
Electric fields
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