Ultrahigh-Q All-Metallic Metasurfaces with Robust Near-Perfect Absorption
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911726885142528 |
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| author | Xu, Hanlei Qi, Han Shi, Chaoying Zhang, Hong Wang, Jun Meng, Ziming Deng, Guoliang Zhou, Hao |
| author_facet | Xu, Hanlei Qi, Han Shi, Chaoying Zhang, Hong Wang, Jun Meng, Ziming Deng, Guoliang Zhou, Hao |
| contents | High quality-factor (Q) resonant metasurfaces have attracted significant attention due to their potential applications in cutting-edge fields of optics. However, limited by intrinsic dissipation losses, achieving both an extremely high Q factor and perfect absorption for strong light-matter interaction control in plasmonic metasurface is still highly challenging. Here, we demonstrate a plasmonic metasurface composed of symmetric double-pillars (SDPs) on a gold film, in which the flexibly tuned geometric space enables precise control over the nonlocality of dark-mode Fabry-Perot bound states in the continuum (FP-BIC) and its coupling with Rayleigh anomaly (RA)-associated lattice resonance. Based on the coupling control between these two modes, the radiative and dissipative losses are well balanced, resulting in a measured Q factor of 2180 (theoretical 2800) and absorption nearly 99%. Notably, the near-perfect absorption response is maintained over broad geometric parameter windows of SDPs (height h=70-120nm, radius r=210-280nm), while the resonance retains a consistently high Q factor throughout these ranges. This hybrid coupling strategy establishes a general framework for designing high-Q, near-critical coupling plasmonic devices for ultrasensitive sensing, narrowband filtering, and active photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_29545 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrahigh-Q All-Metallic Metasurfaces with Robust Near-Perfect Absorption Xu, Hanlei Qi, Han Shi, Chaoying Zhang, Hong Wang, Jun Meng, Ziming Deng, Guoliang Zhou, Hao Optics High quality-factor (Q) resonant metasurfaces have attracted significant attention due to their potential applications in cutting-edge fields of optics. However, limited by intrinsic dissipation losses, achieving both an extremely high Q factor and perfect absorption for strong light-matter interaction control in plasmonic metasurface is still highly challenging. Here, we demonstrate a plasmonic metasurface composed of symmetric double-pillars (SDPs) on a gold film, in which the flexibly tuned geometric space enables precise control over the nonlocality of dark-mode Fabry-Perot bound states in the continuum (FP-BIC) and its coupling with Rayleigh anomaly (RA)-associated lattice resonance. Based on the coupling control between these two modes, the radiative and dissipative losses are well balanced, resulting in a measured Q factor of 2180 (theoretical 2800) and absorption nearly 99%. Notably, the near-perfect absorption response is maintained over broad geometric parameter windows of SDPs (height h=70-120nm, radius r=210-280nm), while the resonance retains a consistently high Q factor throughout these ranges. This hybrid coupling strategy establishes a general framework for designing high-Q, near-critical coupling plasmonic devices for ultrasensitive sensing, narrowband filtering, and active photonics. |
| title | Ultrahigh-Q All-Metallic Metasurfaces with Robust Near-Perfect Absorption |
| topic | Optics |
| url | https://arxiv.org/abs/2605.29545 |