Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths
Metasurface lenses (metalenses) offer an ultrathin and simple optical system with dynamic functions that include focal length tuning. In this study, a rotational varifocal (i.e., moiré) metalens based on octagonal single-crystal silicon pillars was designed and fabricated to realize a high transmitt...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2022-01-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2021-0690 |
| _version_ | 1797947913087746048 |
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| author | Ogawa Chikara Nakamura Sotaro Aso Takumi Ikezawa Satoshi Iwami Kentaro |
| author_facet | Ogawa Chikara Nakamura Sotaro Aso Takumi Ikezawa Satoshi Iwami Kentaro |
| author_sort | Ogawa Chikara |
| collection | DOAJ |
| description | Metasurface lenses (metalenses) offer an ultrathin and simple optical system with dynamic functions that include focal length tuning. In this study, a rotational varifocal (i.e., moiré) metalens based on octagonal single-crystal silicon pillars was designed and fabricated to realize a high transmittance, whole 2π phase coverage, and polarization insensitivity for visible wavelengths. The moiré metalens consists of a pair of cascaded metasurface-based phase lattices and the focal length can be adjusted from negative to positive by mutual rotation. The fabricated moiré metalens demonstrated a focal length that can be tuned from −36 mm to −2 mm and from 2 to 12 mm by mutual rotation from −90° to 90°, and the experimental measurements agreed well with theoretical values at the design wavelength of 633 nm. Imaging was demonstrated at three distinct wavelengths of 633, 532, and 440 nm. |
| first_indexed | 2024-04-10T21:35:13Z |
| format | Article |
| id | doaj.art-af43d64cda404687b0c760d182e6a28b |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-04-10T21:35:13Z |
| publishDate | 2022-01-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-af43d64cda404687b0c760d182e6a28b2023-01-19T12:46:59ZengDe GruyterNanophotonics2192-86142022-01-011191941194810.1515/nanoph-2021-0690Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengthsOgawa Chikara0Nakamura Sotaro1Aso Takumi2Ikezawa Satoshi3Iwami Kentaro4Department of Industrial Technology and Innovation, Tokyo University of Agriculture and Technology, Koganei, Tokyo184-8588, JapanDepartment of Mechanical System Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo184-8588, JapanDepartment of Mechanical System Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo184-8588, JapanDepartment of Mechanical System Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo184-8588, JapanDepartment of Mechanical System Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo184-8588, JapanMetasurface lenses (metalenses) offer an ultrathin and simple optical system with dynamic functions that include focal length tuning. In this study, a rotational varifocal (i.e., moiré) metalens based on octagonal single-crystal silicon pillars was designed and fabricated to realize a high transmittance, whole 2π phase coverage, and polarization insensitivity for visible wavelengths. The moiré metalens consists of a pair of cascaded metasurface-based phase lattices and the focal length can be adjusted from negative to positive by mutual rotation. The fabricated moiré metalens demonstrated a focal length that can be tuned from −36 mm to −2 mm and from 2 to 12 mm by mutual rotation from −90° to 90°, and the experimental measurements agreed well with theoretical values at the design wavelength of 633 nm. Imaging was demonstrated at three distinct wavelengths of 633, 532, and 440 nm.https://doi.org/10.1515/nanoph-2021-0690dielectric metasurfacemetalenssiliconvarifocalwaveguide |
| spellingShingle | Ogawa Chikara Nakamura Sotaro Aso Takumi Ikezawa Satoshi Iwami Kentaro Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths Nanophotonics dielectric metasurface metalens silicon varifocal waveguide |
| title | Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths |
| title_full | Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths |
| title_fullStr | Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths |
| title_full_unstemmed | Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths |
| title_short | Rotational varifocal moiré metalens made of single-crystal silicon meta-atoms for visible wavelengths |
| title_sort | rotational varifocal moire metalens made of single crystal silicon meta atoms for visible wavelengths |
| topic | dielectric metasurface metalens silicon varifocal waveguide |
| url | https://doi.org/10.1515/nanoph-2021-0690 |
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