Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing
Benefitting from the arbitrary and flexible light modulation, metasurface has attracted extensive attention and been demonstrated in different applications. However, most reported metasurface-based devices were normally composed of discrete micro or nano structures, therefore the discretization prec...
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| Format: | Article |
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MDPI AG
2021-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/9/2147 |
| _version_ | 1797536584406401024 |
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| author | Long Chen Zhenglong Shao Jia Liu Dongliang Tang |
| author_facet | Long Chen Zhenglong Shao Jia Liu Dongliang Tang |
| author_sort | Long Chen |
| collection | DOAJ |
| description | Benefitting from the arbitrary and flexible light modulation, metasurface has attracted extensive attention and been demonstrated in different applications. However, most reported metasurface-based devices were normally composed of discrete micro or nano structures, therefore the discretization precision limited the performance of the device, including the focusing efficiency, stray light suppression, and broadband performance. In this work, an all-metallic reflective metasurface consisting of numerous quasi-continuous nanostructures is proposed to realize high-efficiency and broadband focusing. The constructed quasi-continuous metasurface (QCMS) is then verified numerically through electromagnetic simulation, and the numerical results show a higher focusing efficiency and a better stray light suppression effect, compared to a binary-phase-based metalens. Through the same design strategy, a QCMS with the ability to overcome the diffraction limit can also be constructed, and a focal spot with the size of 0.8 times the diffraction limit can be achieved. We expect that this quasi-continuous structure could be utilized to construct other high-performance devices that require continuous phase controls, such as the beam deflector, orbital angle momentum generator, and self-accelerating beam generator. |
| first_indexed | 2024-03-10T12:02:49Z |
| format | Article |
| id | doaj.art-63d9cd6bc90d46938bedcf991536e4bf |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T12:02:49Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-63d9cd6bc90d46938bedcf991536e4bf2023-11-21T16:49:35ZengMDPI AGMaterials1996-19442021-04-01149214710.3390/ma14092147Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light FocusingLong Chen0Zhenglong Shao1Jia Liu2Dongliang Tang3Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, ChinaKey Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, ChinaKey Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, ChinaKey Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, ChinaBenefitting from the arbitrary and flexible light modulation, metasurface has attracted extensive attention and been demonstrated in different applications. However, most reported metasurface-based devices were normally composed of discrete micro or nano structures, therefore the discretization precision limited the performance of the device, including the focusing efficiency, stray light suppression, and broadband performance. In this work, an all-metallic reflective metasurface consisting of numerous quasi-continuous nanostructures is proposed to realize high-efficiency and broadband focusing. The constructed quasi-continuous metasurface (QCMS) is then verified numerically through electromagnetic simulation, and the numerical results show a higher focusing efficiency and a better stray light suppression effect, compared to a binary-phase-based metalens. Through the same design strategy, a QCMS with the ability to overcome the diffraction limit can also be constructed, and a focal spot with the size of 0.8 times the diffraction limit can be achieved. We expect that this quasi-continuous structure could be utilized to construct other high-performance devices that require continuous phase controls, such as the beam deflector, orbital angle momentum generator, and self-accelerating beam generator.https://www.mdpi.com/1996-1944/14/9/2147quasi-continuousmetasurfaceall-metallicdiffraction limit |
| spellingShingle | Long Chen Zhenglong Shao Jia Liu Dongliang Tang Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing Materials quasi-continuous metasurface all-metallic diffraction limit |
| title | Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing |
| title_full | Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing |
| title_fullStr | Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing |
| title_full_unstemmed | Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing |
| title_short | Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing |
| title_sort | reflective quasi continuous metasurface with continuous phase control for light focusing |
| topic | quasi-continuous metasurface all-metallic diffraction limit |
| url | https://www.mdpi.com/1996-1944/14/9/2147 |
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