Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens
Metalens with broadband and high-efficiency focusing functionality is desired in various underwater acoustic applications such as sonar and oceanography. Here we design and demonstrate a metagrating-based lens consisting of spatially sparse and wavelength-scale meta-atoms with optimized structures....
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ac8e27 |
| _version_ | 1797748397798588416 |
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| author | Jun Mei Lijuan Fan Xiaobin Hong |
| author_facet | Jun Mei Lijuan Fan Xiaobin Hong |
| author_sort | Jun Mei |
| collection | DOAJ |
| description | Metalens with broadband and high-efficiency focusing functionality is desired in various underwater acoustic applications such as sonar and oceanography. Here we design and demonstrate a metagrating-based lens consisting of spatially sparse and wavelength-scale meta-atoms with optimized structures. With the help of grating diffraction analysis and intelligent optimization algorithm, the reflective metalens enables broadband and high-numerical-aperture focusing for waterborne sound over a 40 kHz-bandwidth for working frequency at 200 kHz. Full-wave numerical simulations unambiguously verify a sharp and high-efficiency focusing of sound wave intensity, with the full width at half maximum at the focal spot being smaller than 0.5 λ and thus beating the Rayleigh–Abbe diffraction limit. Our work not only provides an intelligent design paradigm of high-performance metalens, but also presents a potential solution for the development of planar acoustic devices for high-resolution applications. |
| first_indexed | 2024-03-12T16:05:08Z |
| format | Article |
| id | doaj.art-f9a2103b4b4c4395968c01a3912e3a1d |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:05:08Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-f9a2103b4b4c4395968c01a3912e3a1d2023-08-09T14:26:31ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124909301410.1088/1367-2630/ac8e27Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lensJun Mei0https://orcid.org/0000-0002-6308-4956Lijuan Fan1Xiaobin Hong2School of Physics, South China University of Technology , Guangzhou 516040, People’s Republic of ChinaSchool of Physics, South China University of Technology , Guangzhou 516040, People’s Republic of ChinaSchool of Mechanical & Automotive Engineering, South China University of Technology , Guangzhou 510641, People’s Republic of ChinaMetalens with broadband and high-efficiency focusing functionality is desired in various underwater acoustic applications such as sonar and oceanography. Here we design and demonstrate a metagrating-based lens consisting of spatially sparse and wavelength-scale meta-atoms with optimized structures. With the help of grating diffraction analysis and intelligent optimization algorithm, the reflective metalens enables broadband and high-numerical-aperture focusing for waterborne sound over a 40 kHz-bandwidth for working frequency at 200 kHz. Full-wave numerical simulations unambiguously verify a sharp and high-efficiency focusing of sound wave intensity, with the full width at half maximum at the focal spot being smaller than 0.5 λ and thus beating the Rayleigh–Abbe diffraction limit. Our work not only provides an intelligent design paradigm of high-performance metalens, but also presents a potential solution for the development of planar acoustic devices for high-resolution applications.https://doi.org/10.1088/1367-2630/ac8e27metagratingsuper-resolution metalensbroadband focusingsub-diffraction focusing |
| spellingShingle | Jun Mei Lijuan Fan Xiaobin Hong Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens New Journal of Physics metagrating super-resolution metalens broadband focusing sub-diffraction focusing |
| title | Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens |
| title_full | Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens |
| title_fullStr | Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens |
| title_full_unstemmed | Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens |
| title_short | Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens |
| title_sort | broadband and high numerical aperture sharp focusing for waterborne sound with metagrating based lens |
| topic | metagrating super-resolution metalens broadband focusing sub-diffraction focusing |
| url | https://doi.org/10.1088/1367-2630/ac8e27 |
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