Ultrafast control of braiding topology in non-Hermitian metasurfaces
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866912081594286080 |
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| author | Hu, Yuze Tong, Mingyu Ren, Ziheng Chen, Fujia Chen, Qiaolu Chen, Hongsheng Jiang, Tian Yang, Yihao |
| author_facet | Hu, Yuze Tong, Mingyu Ren, Ziheng Chen, Fujia Chen, Qiaolu Chen, Hongsheng Jiang, Tian Yang, Yihao |
| contents | The mathematical theory of braids, influential across scientific disciplines, has emerged as a compelling strategy for light manipulation. Existing approaches to creating braids in photonics, whether in momentum-space bandstructures or real-space fields, often face limitations associated with static nature of devices and lack of tunability. Here, we experimentally demonstrate ultrafast control of eigen-spectrum braids of Jones matrices within mere picoseconds, in reconfigurable non-Hermitian metasurfaces. The Jones matrices of the metasurface exhibit a complex eigen-spectrum that braids in the three-dimensional eigenvalue-frequency space, thereby creating arbitrary elements within the two-string braid group, B2. By exciting the photoconductive semiconductor terahertz metasurface with a femtosecond infrared pulse, we achieve ultrafast switching of the braids, transitioning from the Solomon link to either the Trefoil knot or Hopf link. Our approach serves as a pivotal tool for elucidating non-trivial topology of braids and studying ultrafast topological optoelectronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_16756 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast control of braiding topology in non-Hermitian metasurfaces Hu, Yuze Tong, Mingyu Ren, Ziheng Chen, Fujia Chen, Qiaolu Chen, Hongsheng Jiang, Tian Yang, Yihao Optics The mathematical theory of braids, influential across scientific disciplines, has emerged as a compelling strategy for light manipulation. Existing approaches to creating braids in photonics, whether in momentum-space bandstructures or real-space fields, often face limitations associated with static nature of devices and lack of tunability. Here, we experimentally demonstrate ultrafast control of eigen-spectrum braids of Jones matrices within mere picoseconds, in reconfigurable non-Hermitian metasurfaces. The Jones matrices of the metasurface exhibit a complex eigen-spectrum that braids in the three-dimensional eigenvalue-frequency space, thereby creating arbitrary elements within the two-string braid group, B2. By exciting the photoconductive semiconductor terahertz metasurface with a femtosecond infrared pulse, we achieve ultrafast switching of the braids, transitioning from the Solomon link to either the Trefoil knot or Hopf link. Our approach serves as a pivotal tool for elucidating non-trivial topology of braids and studying ultrafast topological optoelectronics. |
| title | Ultrafast control of braiding topology in non-Hermitian metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2410.16756 |