Non-orthogonal cavity modes near exceptional points in the far field
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911749390729216 |
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| author | Yang, Jingnan Shi, Shushu Yan, Sai Zhu, Rui Zhao, Xiaoming Qin, Yi Fu, Bowen Chen, Xiqing Li, Hancong Zuo, Zhanchun Jin, Kuijuan Gong, Qihuang Xu, Xiulai |
| author_facet | Yang, Jingnan Shi, Shushu Yan, Sai Zhu, Rui Zhao, Xiaoming Qin, Yi Fu, Bowen Chen, Xiqing Li, Hancong Zuo, Zhanchun Jin, Kuijuan Gong, Qihuang Xu, Xiulai |
| contents | Non-orthogonal eigenstates are a fundamental feature of non-Hermitian systems and are accompanied by the emergence of nontrivial features. However, the platforms to explore non-Hermitian mode couplings mainly measure near-field effects, and the far-field behaviour remain mostly unexplored. Here, we study how a microcavity with non-Hermitian mode coupling exhibits eigenstate non-orthogonality by investigating the spatial field and the far-field polarization of cavity modes. The non-Hermiticity arises from asymmetric backscattering, which is controlled by integrating two scatterers of different size and location into a microdisk. We observe that the spatial field overlaps of two modes increases abruptly to its maximum value, whilst different far-field elliptical polarizations of two modes coalesce when approaching an exceptional point. We demonstrate such features experimentally by measuring the far-field polarization from the fabricated microdisks. Our work reveals the non-orthogonality in the far-field degree of freedom, and the integrability of the microdisks paves a way to integrate more non-Hermitian optical properties into nanophotonic systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_03165 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-orthogonal cavity modes near exceptional points in the far field Yang, Jingnan Shi, Shushu Yan, Sai Zhu, Rui Zhao, Xiaoming Qin, Yi Fu, Bowen Chen, Xiqing Li, Hancong Zuo, Zhanchun Jin, Kuijuan Gong, Qihuang Xu, Xiulai Optics Non-orthogonal eigenstates are a fundamental feature of non-Hermitian systems and are accompanied by the emergence of nontrivial features. However, the platforms to explore non-Hermitian mode couplings mainly measure near-field effects, and the far-field behaviour remain mostly unexplored. Here, we study how a microcavity with non-Hermitian mode coupling exhibits eigenstate non-orthogonality by investigating the spatial field and the far-field polarization of cavity modes. The non-Hermiticity arises from asymmetric backscattering, which is controlled by integrating two scatterers of different size and location into a microdisk. We observe that the spatial field overlaps of two modes increases abruptly to its maximum value, whilst different far-field elliptical polarizations of two modes coalesce when approaching an exceptional point. We demonstrate such features experimentally by measuring the far-field polarization from the fabricated microdisks. Our work reveals the non-orthogonality in the far-field degree of freedom, and the integrability of the microdisks paves a way to integrate more non-Hermitian optical properties into nanophotonic systems. |
| title | Non-orthogonal cavity modes near exceptional points in the far field |
| topic | Optics |
| url | https://arxiv.org/abs/2401.03165 |