Polarization-dependent metalens with flexible and steerable bifocal spots
Lenses are an important part of modern optical systems. We propose metalenses with bifocal spots, which realizes the beam focusing with controllable intensity ratio and free deflection of the bifocal spots. The metalens consists of an array of titanium dioxide (TiO2) nanopillars, which can provide t...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-03-01
|
| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723000797 |
| _version_ | 1827990104974557184 |
|---|---|
| author | Yuhang Sun Yumin Liu Tiesheng Wu Jing Li Hongjie Fan Xueyu Wang |
| author_facet | Yuhang Sun Yumin Liu Tiesheng Wu Jing Li Hongjie Fan Xueyu Wang |
| author_sort | Yuhang Sun |
| collection | DOAJ |
| description | Lenses are an important part of modern optical systems. We propose metalenses with bifocal spots, which realizes the beam focusing with controllable intensity ratio and free deflection of the bifocal spots. The metalens consists of an array of titanium dioxide (TiO2) nanopillars, which can provide two different propagation phases for x-linear polarization (XLP) and y-linear polarization (YLP) incidence, respectively. Therefore, by precisely choosing the size of the nanopillars, it is possible to produce two different focal spots for the two orthogonal input polarized light. And the intensity of the two focal points can be adjusted by changing the polarization angle of the incident light. Superimposing the initial phase distribution of the metalens and the phase distribution of the beam deflector metasurface enables multi-dimensional adjustment of the two focal points and realizes the free deflection characteristics of the metalens. The deflection angle of the focal spot is close to the theoretical deflection angle. In addition, multiple superposition can produce more deflection angles or deflect the focus to a two-dimensional plane. The method of controlling the targeting phase of the metalens by superimposing additional phases gives us the ability to fully manipulate the phase and wavefront of the metalens, providing a new idea for the continuous angle change of future optical lenses. |
| first_indexed | 2024-04-10T00:30:28Z |
| format | Article |
| id | doaj.art-ffbee803090c42778e04c8dbd8ac6c01 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-10T00:30:28Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-ffbee803090c42778e04c8dbd8ac6c012023-03-15T04:27:48ZengElsevierResults in Physics2211-37972023-03-0146106286Polarization-dependent metalens with flexible and steerable bifocal spotsYuhang Sun0Yumin Liu1Tiesheng Wu2Jing Li3Hongjie Fan4Xueyu Wang5State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China; Corresponding author.College of Information and Communication Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaLenses are an important part of modern optical systems. We propose metalenses with bifocal spots, which realizes the beam focusing with controllable intensity ratio and free deflection of the bifocal spots. The metalens consists of an array of titanium dioxide (TiO2) nanopillars, which can provide two different propagation phases for x-linear polarization (XLP) and y-linear polarization (YLP) incidence, respectively. Therefore, by precisely choosing the size of the nanopillars, it is possible to produce two different focal spots for the two orthogonal input polarized light. And the intensity of the two focal points can be adjusted by changing the polarization angle of the incident light. Superimposing the initial phase distribution of the metalens and the phase distribution of the beam deflector metasurface enables multi-dimensional adjustment of the two focal points and realizes the free deflection characteristics of the metalens. The deflection angle of the focal spot is close to the theoretical deflection angle. In addition, multiple superposition can produce more deflection angles or deflect the focus to a two-dimensional plane. The method of controlling the targeting phase of the metalens by superimposing additional phases gives us the ability to fully manipulate the phase and wavefront of the metalens, providing a new idea for the continuous angle change of future optical lenses.http://www.sciencedirect.com/science/article/pii/S2211379723000797Bifocal metalensPolarization dependentSteerable position of focal spotsAll-dielectric metasurfacesIntegrated optics |
| spellingShingle | Yuhang Sun Yumin Liu Tiesheng Wu Jing Li Hongjie Fan Xueyu Wang Polarization-dependent metalens with flexible and steerable bifocal spots Results in Physics Bifocal metalens Polarization dependent Steerable position of focal spots All-dielectric metasurfaces Integrated optics |
| title | Polarization-dependent metalens with flexible and steerable bifocal spots |
| title_full | Polarization-dependent metalens with flexible and steerable bifocal spots |
| title_fullStr | Polarization-dependent metalens with flexible and steerable bifocal spots |
| title_full_unstemmed | Polarization-dependent metalens with flexible and steerable bifocal spots |
| title_short | Polarization-dependent metalens with flexible and steerable bifocal spots |
| title_sort | polarization dependent metalens with flexible and steerable bifocal spots |
| topic | Bifocal metalens Polarization dependent Steerable position of focal spots All-dielectric metasurfaces Integrated optics |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723000797 |
| work_keys_str_mv | AT yuhangsun polarizationdependentmetalenswithflexibleandsteerablebifocalspots AT yuminliu polarizationdependentmetalenswithflexibleandsteerablebifocalspots AT tieshengwu polarizationdependentmetalenswithflexibleandsteerablebifocalspots AT jingli polarizationdependentmetalenswithflexibleandsteerablebifocalspots AT hongjiefan polarizationdependentmetalenswithflexibleandsteerablebifocalspots AT xueyuwang polarizationdependentmetalenswithflexibleandsteerablebifocalspots |