Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function
The phenomenon of optical superoscillation provides an unprecedented way to solve the problem of optical far-field label-free super-resolution imaging. Numerous optical devices that enable superoscillatory focusing were developed based on scalar and vector diffraction theories in the past several ye...
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| Format: | Article |
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/19/3485 |
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| author | Yu Li Xinhao Fan Yunfeng Huang Xuyue Guo Liang Zhou Peng Li Jianlin Zhao |
| author_facet | Yu Li Xinhao Fan Yunfeng Huang Xuyue Guo Liang Zhou Peng Li Jianlin Zhao |
| author_sort | Yu Li |
| collection | DOAJ |
| description | The phenomenon of optical superoscillation provides an unprecedented way to solve the problem of optical far-field label-free super-resolution imaging. Numerous optical devices that enable superoscillatory focusing were developed based on scalar and vector diffraction theories in the past several years. However, these reported devices are designed according to the half-wave zone method in spatial coordinates. In this paper, we propose a dielectric metalens for superoscillatory focusing based on the diffraction of angular Bessel functional phase modulated vector field, under the inspiration of the tightly autofocusing property of a radially polarized high-order Bessel beam. Based on this kind of metalens with a numerical aperture (NA) of 0.9, the linearly polarized light is converted into a radially polarized one and then focus into a superoscillating focal spot with the size of 0.32<i>λ</i>/NA. This angular spectrum modulation theory involved in this paper provides a different way of designing superoscillatory devices. |
| first_indexed | 2024-03-09T21:21:04Z |
| format | Article |
| id | doaj.art-b059a7a8da224791b6faa185d801dab3 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T21:21:04Z |
| publishDate | 2022-10-01 |
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| series | Nanomaterials |
| spelling | doaj.art-b059a7a8da224791b6faa185d801dab32023-11-23T21:20:50ZengMDPI AGNanomaterials2079-49912022-10-011219348510.3390/nano12193485Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel FunctionYu Li0Xinhao Fan1Yunfeng Huang2Xuyue Guo3Liang Zhou4Peng Li5Jianlin Zhao6MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaMOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaMOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaMOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaMOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaMOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaMOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, ChinaThe phenomenon of optical superoscillation provides an unprecedented way to solve the problem of optical far-field label-free super-resolution imaging. Numerous optical devices that enable superoscillatory focusing were developed based on scalar and vector diffraction theories in the past several years. However, these reported devices are designed according to the half-wave zone method in spatial coordinates. In this paper, we propose a dielectric metalens for superoscillatory focusing based on the diffraction of angular Bessel functional phase modulated vector field, under the inspiration of the tightly autofocusing property of a radially polarized high-order Bessel beam. Based on this kind of metalens with a numerical aperture (NA) of 0.9, the linearly polarized light is converted into a radially polarized one and then focus into a superoscillating focal spot with the size of 0.32<i>λ</i>/NA. This angular spectrum modulation theory involved in this paper provides a different way of designing superoscillatory devices.https://www.mdpi.com/2079-4991/12/19/3485superoscillationvector beammetalenspolarizationdiffraction |
| spellingShingle | Yu Li Xinhao Fan Yunfeng Huang Xuyue Guo Liang Zhou Peng Li Jianlin Zhao Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function Nanomaterials superoscillation vector beam metalens polarization diffraction |
| title | Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function |
| title_full | Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function |
| title_fullStr | Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function |
| title_full_unstemmed | Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function |
| title_short | Dielectric Metalens for Superoscillatory Focusing Based on High-Order Angular Bessel Function |
| title_sort | dielectric metalens for superoscillatory focusing based on high order angular bessel function |
| topic | superoscillation vector beam metalens polarization diffraction |
| url | https://www.mdpi.com/2079-4991/12/19/3485 |
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