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Zenodo
2025
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| Accesso online: | https://doi.org/10.1038/s41566-025-01670-9 |
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| _version_ | 1866901929063350272 |
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| author | Nan, Lin Mancini, Andrea Weber, Thomas Seah, Geok Leng Cortes, Emiliano Tittl, Andreas Maier, Stefan A. |
| author_facet | Nan, Lin Mancini, Andrea Weber, Thomas Seah, Geok Leng Cortes, Emiliano Tittl, Andreas Maier, Stefan A. |
| contents | <p>Quasi-bound states in the continuum (qBICs) achieved through symmetry breaking in photonic metasurfaces are a powerful approach for engineering resonances with high quality factors and tunability. However, miniaturization of these devices is limited as the in-plane unit-cell size typically scales linearly with the resonant wavelength. By contrast, polariton resonators can be deeply subwavelength, offering a promising solution for achieving compact devices. Here we demonstrate that low-loss mid-infrared surface phonon polaritons enable metasurfaces supporting qBICs with unit-cell volumes up to 10<sup>5</sup> times smaller than the free-space volume. Using 100-nm-thick free-standing silicon carbide membranes, we achieve highly confined qBIC states with exceptional robustness against incident-angle variations, a feature unique among qBIC systems. This absence of angular dispersion enables mid-infrared vibrational sensing of thin, weakly absorbing molecular layers using a reflective objective, a method that typically degrades resonance quality in standard qBIC metasurfaces. We introduce surface-phonon-polariton-based qBICs as a platform for ultraconfined nanophotonic systems, advancing the miniaturization of mid-infrared sensors and devices for thermal radiation engineering.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_1038_s41566-025-01670-9 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Angular dispersion suppression in deeply subwavelength phonon polariton bound states in the continuum metasurfaces Nan, Lin Mancini, Andrea Weber, Thomas Seah, Geok Leng Cortes, Emiliano Tittl, Andreas Maier, Stefan A. <p>Quasi-bound states in the continuum (qBICs) achieved through symmetry breaking in photonic metasurfaces are a powerful approach for engineering resonances with high quality factors and tunability. However, miniaturization of these devices is limited as the in-plane unit-cell size typically scales linearly with the resonant wavelength. By contrast, polariton resonators can be deeply subwavelength, offering a promising solution for achieving compact devices. Here we demonstrate that low-loss mid-infrared surface phonon polaritons enable metasurfaces supporting qBICs with unit-cell volumes up to 10<sup>5</sup> times smaller than the free-space volume. Using 100-nm-thick free-standing silicon carbide membranes, we achieve highly confined qBIC states with exceptional robustness against incident-angle variations, a feature unique among qBIC systems. This absence of angular dispersion enables mid-infrared vibrational sensing of thin, weakly absorbing molecular layers using a reflective objective, a method that typically degrades resonance quality in standard qBIC metasurfaces. We introduce surface-phonon-polariton-based qBICs as a platform for ultraconfined nanophotonic systems, advancing the miniaturization of mid-infrared sensors and devices for thermal radiation engineering.</p> |
| title | Angular dispersion suppression in deeply subwavelength phonon polariton bound states in the continuum metasurfaces |
| url | https://doi.org/10.1038/s41566-025-01670-9 |