Hyperbolic-enhanced Raman scattering in van der Waals MoOCl2: from Fano resonances to picomolar detection
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Minnekhanov, Anton Tikhonowski, Gleb Ermolaev, Georgy Kravtsov, Konstantin V. Tselikov, Gleb Toksumakov, Adilet Slavich, Aleksandr Kazantsev, Ivan Vyshnevyy, Andrey Kruglov, Ivan Radko, Ilya Sofer, Zdenek Arsenin, Aleksey Novoselov, Kostya S. Volkov, Valentyn |
| author_facet | Minnekhanov, Anton Tikhonowski, Gleb Ermolaev, Georgy Kravtsov, Konstantin V. Tselikov, Gleb Toksumakov, Adilet Slavich, Aleksandr Kazantsev, Ivan Vyshnevyy, Andrey Kruglov, Ivan Radko, Ilya Sofer, Zdenek Arsenin, Aleksey Novoselov, Kostya S. Volkov, Valentyn |
| contents | Natural van der Waals (vdW) crystals with hyperbolic dispersion challenge artificial metamaterials but remain confined to the mid-infrared spectrum. The emergence of MoOCl2, a quasi-one-dimensional metal with in-plane hyperbolicity, overcomes this spectral limit, shifting the focus to the practical visible range. Here, utilizing angle-resolved Raman spectroscopy, we uncover a highly anisotropic vibrational response characterized by pronounced Fano resonances and polarization switching, which serve as signatures of strong coupling between phonons and the metallic continuum. Harnessing this interaction, we demonstrate "Hyperbolic-Enhanced Raman" (HypER) scattering, where MoOCl2 provides polarization-tunable enhancement factors exceeding 10^7 and picomolar-level detection down to 100 pM, without any nanostructuring. These results establish MoOCl2 as a simple, air-stable, wafer-compatible platform for visible-range hyperbolic nanophotonics and lithography-free sensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_17647 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hyperbolic-enhanced Raman scattering in van der Waals MoOCl2: from Fano resonances to picomolar detection Minnekhanov, Anton Tikhonowski, Gleb Ermolaev, Georgy Kravtsov, Konstantin V. Tselikov, Gleb Toksumakov, Adilet Slavich, Aleksandr Kazantsev, Ivan Vyshnevyy, Andrey Kruglov, Ivan Radko, Ilya Sofer, Zdenek Arsenin, Aleksey Novoselov, Kostya S. Volkov, Valentyn Optics Mesoscale and Nanoscale Physics Materials Science Applied Physics Natural van der Waals (vdW) crystals with hyperbolic dispersion challenge artificial metamaterials but remain confined to the mid-infrared spectrum. The emergence of MoOCl2, a quasi-one-dimensional metal with in-plane hyperbolicity, overcomes this spectral limit, shifting the focus to the practical visible range. Here, utilizing angle-resolved Raman spectroscopy, we uncover a highly anisotropic vibrational response characterized by pronounced Fano resonances and polarization switching, which serve as signatures of strong coupling between phonons and the metallic continuum. Harnessing this interaction, we demonstrate "Hyperbolic-Enhanced Raman" (HypER) scattering, where MoOCl2 provides polarization-tunable enhancement factors exceeding 10^7 and picomolar-level detection down to 100 pM, without any nanostructuring. These results establish MoOCl2 as a simple, air-stable, wafer-compatible platform for visible-range hyperbolic nanophotonics and lithography-free sensing. |
| title | Hyperbolic-enhanced Raman scattering in van der Waals MoOCl2: from Fano resonances to picomolar detection |
| topic | Optics Mesoscale and Nanoscale Physics Materials Science Applied Physics |
| url | https://arxiv.org/abs/2512.17647 |