Switchable high-Q light absorbers based on phase-change resonant metasurfaces
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911442505039872 |
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| author | Qi, Kai Wang, Guoxiang Shen, Xiang Gao, Yixiao |
| author_facet | Qi, Kai Wang, Guoxiang Shen, Xiang Gao, Yixiao |
| contents | In this paper, we propose a switchable high-Q light absorber based on a reconfigurable metasurface enabled by a lowloss phase-change material (PCM). By leveraging the coupling between guided-mode resonance and Fabry-Perot modes, mediated by the phase-transition dynamics of the embedded PCM, the resonance Q factor can be actively tuned. This allows the system to switch from a perfect dark state, governed by the physics of bound states in the continuum, to a critically coupled resonance with a finite Q factor. Consequently, the metasurface exhibits perfect absorption in the amorphous state and a reflection-dominated response in the crystalline state. The proposed metasurface holds significant potential for diverse nanophotonic applications, including photodetection and thermal emission control. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_11535 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Switchable high-Q light absorbers based on phase-change resonant metasurfaces Qi, Kai Wang, Guoxiang Shen, Xiang Gao, Yixiao Optics In this paper, we propose a switchable high-Q light absorber based on a reconfigurable metasurface enabled by a lowloss phase-change material (PCM). By leveraging the coupling between guided-mode resonance and Fabry-Perot modes, mediated by the phase-transition dynamics of the embedded PCM, the resonance Q factor can be actively tuned. This allows the system to switch from a perfect dark state, governed by the physics of bound states in the continuum, to a critically coupled resonance with a finite Q factor. Consequently, the metasurface exhibits perfect absorption in the amorphous state and a reflection-dominated response in the crystalline state. The proposed metasurface holds significant potential for diverse nanophotonic applications, including photodetection and thermal emission control. |
| title | Switchable high-Q light absorbers based on phase-change resonant metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2602.11535 |