Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures
Metalenses have excellent modulation capabilities in terms of phase, amplitude, and polarization of light, significantly reducing the size and complexity of imaging systems, and showing great application prospects. However, like traditional optical meta-atoms, ordinary metalenses suffer from a signi...
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| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/1/31 |
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| author | Yongyang Li Haiyang Huang Cong Zhang Xiangshuo Shang Yang Liu Junyan Hu Dengyu Shan Naiyun Tang Wei Li |
| author_facet | Yongyang Li Haiyang Huang Cong Zhang Xiangshuo Shang Yang Liu Junyan Hu Dengyu Shan Naiyun Tang Wei Li |
| author_sort | Yongyang Li |
| collection | DOAJ |
| description | Metalenses have excellent modulation capabilities in terms of phase, amplitude, and polarization of light, significantly reducing the size and complexity of imaging systems, and showing great application prospects. However, like traditional optical meta-atoms, ordinary metalenses suffer from a significant chromatic aberration problem because it is difficult to design the phase distribution for different wavelengths on a single-layer metalens. To address this, various methods for correcting chromatic aberration in metalenses have been proposed and demonstrated, such as spatial multiplexing, material hybridization, and increasing the cross-sectional diversity of metalens meta-atoms. In this paper, a novel design method is used, which expands the parameter space by increasing the cross-sectional diversity of the metalens meta-atoms to provide the phase required for focusing different wavelengths, combined with particle swarm optimization for phase compensation. The multi-level metalens designed by this method achieves a constant and approximate focal length in the visible wavelength range of λ = 450–650 nm, with a polarization-independent absolute focusing efficiency of about 17%, and a numerical aperture (NA) of 0.31 for a lens diameter of 100 μm. This improves the imaging quality. |
| format | Article |
| id | doaj-art-97f4396b0bae4235bbd3c7832d70e888 |
| institution | Kabale University |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-97f4396b0bae4235bbd3c7832d70e8882025-01-24T13:46:15ZengMDPI AGPhotonics2304-67322025-01-011213110.3390/photonics12010031Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar StructuresYongyang Li0Haiyang Huang1Cong Zhang2Xiangshuo Shang3Yang Liu4Junyan Hu5Dengyu Shan6Naiyun Tang7Wei Li8College of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaState Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaZhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization, Westlake Institute for Optoelectronics, Fuyang, Hangzhou 311421, ChinaState Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaState Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaZhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization, Westlake Institute for Optoelectronics, Fuyang, Hangzhou 311421, ChinaZhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization, Westlake Institute for Optoelectronics, Fuyang, Hangzhou 311421, ChinaCollege of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaState Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaMetalenses have excellent modulation capabilities in terms of phase, amplitude, and polarization of light, significantly reducing the size and complexity of imaging systems, and showing great application prospects. However, like traditional optical meta-atoms, ordinary metalenses suffer from a significant chromatic aberration problem because it is difficult to design the phase distribution for different wavelengths on a single-layer metalens. To address this, various methods for correcting chromatic aberration in metalenses have been proposed and demonstrated, such as spatial multiplexing, material hybridization, and increasing the cross-sectional diversity of metalens meta-atoms. In this paper, a novel design method is used, which expands the parameter space by increasing the cross-sectional diversity of the metalens meta-atoms to provide the phase required for focusing different wavelengths, combined with particle swarm optimization for phase compensation. The multi-level metalens designed by this method achieves a constant and approximate focal length in the visible wavelength range of λ = 450–650 nm, with a polarization-independent absolute focusing efficiency of about 17%, and a numerical aperture (NA) of 0.31 for a lens diameter of 100 μm. This improves the imaging quality.https://www.mdpi.com/2304-6732/12/1/31variable height pillarsmulti-level metalensachromatic correctionvisible lightbroadbandfocusing efficiency |
| spellingShingle | Yongyang Li Haiyang Huang Cong Zhang Xiangshuo Shang Yang Liu Junyan Hu Dengyu Shan Naiyun Tang Wei Li Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures Photonics variable height pillars multi-level metalens achromatic correction visible light broadband focusing efficiency |
| title | Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures |
| title_full | Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures |
| title_fullStr | Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures |
| title_full_unstemmed | Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures |
| title_short | Visible Light Broadband Achromatic Metalens Based on Variable Height Nanopillar Structures |
| title_sort | visible light broadband achromatic metalens based on variable height nanopillar structures |
| topic | variable height pillars multi-level metalens achromatic correction visible light broadband focusing efficiency |
| url | https://www.mdpi.com/2304-6732/12/1/31 |
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