Ultrasensitive Higher-Order Exceptional Points via Non-Hermitian Zero-Index Materials
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866918063660597248 |
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| author | Yan, Dongyang Shalin, Alexander S. Wang, Yongxing Lai, Yun Xu, Yadong Hang, Zhi Hong Cao, Fang Gao, Lei Luo, Jie |
| author_facet | Yan, Dongyang Shalin, Alexander S. Wang, Yongxing Lai, Yun Xu, Yadong Hang, Zhi Hong Cao, Fang Gao, Lei Luo, Jie |
| contents | Higher-order exceptional points (EPs) in optical structures enable ultra-sensitive responses to perturbations. However, previous investigations on higher-order EPs have predominantly focused on coupled systems, leaving their fundamental physics in open scattering systems largely unexplored. Here, we harness wave interference to realize higher-order EPs in non-Hermitian zero-index materials connected to multiple open channels. Specifically, we show that a three-channel model can give rise to three interesting types of third-order EPs: lasing EP, reflecting EP, and absorbing EP. Notably, near the third-order absorbing EP, we show ultrasensitivity -- a drastic change in output power in response to perturbations at the operating frequency -- in a purely lossy system. These findings pave the way for achieving higher-order and even arbitrary-order EPs in open scattering systems, offering significant potential for advanced sensing applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_07974 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrasensitive Higher-Order Exceptional Points via Non-Hermitian Zero-Index Materials Yan, Dongyang Shalin, Alexander S. Wang, Yongxing Lai, Yun Xu, Yadong Hang, Zhi Hong Cao, Fang Gao, Lei Luo, Jie Optics Applied Physics Higher-order exceptional points (EPs) in optical structures enable ultra-sensitive responses to perturbations. However, previous investigations on higher-order EPs have predominantly focused on coupled systems, leaving their fundamental physics in open scattering systems largely unexplored. Here, we harness wave interference to realize higher-order EPs in non-Hermitian zero-index materials connected to multiple open channels. Specifically, we show that a three-channel model can give rise to three interesting types of third-order EPs: lasing EP, reflecting EP, and absorbing EP. Notably, near the third-order absorbing EP, we show ultrasensitivity -- a drastic change in output power in response to perturbations at the operating frequency -- in a purely lossy system. These findings pave the way for achieving higher-order and even arbitrary-order EPs in open scattering systems, offering significant potential for advanced sensing applications. |
| title | Ultrasensitive Higher-Order Exceptional Points via Non-Hermitian Zero-Index Materials |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2501.07974 |