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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2511.12037 |
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| _version_ | 1866917081391300608 |
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| author | Liu, Zhen Yin, Xuefan Bogdanov, Andrey Nie, Yujia Zuo, Yi Li, Hongbin Wang, Feifan Peng, Chao |
| author_facet | Liu, Zhen Yin, Xuefan Bogdanov, Andrey Nie, Yujia Zuo, Yi Li, Hongbin Wang, Feifan Peng, Chao |
| contents | Multistability -- the emergence of multiple stable states under identical conditions -- is a hallmark of nonlinear complexity and an enabling mechanism for multilevel optical memory and photonic computing. Its realization in a compact footprint, however, is limited by intrinsically weak optical nonlinearities and the enlarged free spectral range that raises the multistability threshold. Here, we overcome this constraint by engineering a pair of spectrally close, ultra-high-Q resonances in a photonic crystal microcavity. Leveraging structural perturbations that deliberately introduce non-Hermitian coupling through a shared radiation channel, we drive the resonances toward an exceptional point with nearly degenerate wavelengths and balanced quality factors approaching $10^6$. This configuration substantially enhances thermo-optical nonlinearity and produces pronounced tristability and hysteresis loops within a footprint of 20 μm at input powers below 240 μW. We further demonstrate proof-of-concept optical random-access memory through controlled switching among multistable states. These results establish a general strategy for nonlinear microcavities to achieve energy-efficient multistability for reconfigurable all-optical memories, logic, and neuromorphic processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_12037 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical multistability in a compact microcavity enabled by near-exceptional coupling Liu, Zhen Yin, Xuefan Bogdanov, Andrey Nie, Yujia Zuo, Yi Li, Hongbin Wang, Feifan Peng, Chao Optics Multistability -- the emergence of multiple stable states under identical conditions -- is a hallmark of nonlinear complexity and an enabling mechanism for multilevel optical memory and photonic computing. Its realization in a compact footprint, however, is limited by intrinsically weak optical nonlinearities and the enlarged free spectral range that raises the multistability threshold. Here, we overcome this constraint by engineering a pair of spectrally close, ultra-high-Q resonances in a photonic crystal microcavity. Leveraging structural perturbations that deliberately introduce non-Hermitian coupling through a shared radiation channel, we drive the resonances toward an exceptional point with nearly degenerate wavelengths and balanced quality factors approaching $10^6$. This configuration substantially enhances thermo-optical nonlinearity and produces pronounced tristability and hysteresis loops within a footprint of 20 μm at input powers below 240 μW. We further demonstrate proof-of-concept optical random-access memory through controlled switching among multistable states. These results establish a general strategy for nonlinear microcavities to achieve energy-efficient multistability for reconfigurable all-optical memories, logic, and neuromorphic processors. |
| title | Optical multistability in a compact microcavity enabled by near-exceptional coupling |
| topic | Optics |
| url | https://arxiv.org/abs/2511.12037 |