Interface second harmonic generation enhancement in hetero-bilayer van der Waals nanoantennas
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Tognazzi, Andrea Franceschini, Paolo Biechteler, Jonas Baù, Enrico Cino, Alfonso Carmelo Tittl, Andreas De Angelis, Costantino Sortino, Luca |
| author_facet | Tognazzi, Andrea Franceschini, Paolo Biechteler, Jonas Baù, Enrico Cino, Alfonso Carmelo Tittl, Andreas De Angelis, Costantino Sortino, Luca |
| contents | Layered van der Waals (vdW) materials have emerged as a promising platform for nanophotonics due to large refractive indexes and giant optical anisotropy. Unlike conventional dielectrics and semiconductors, the absence of covalent bonds between layers allows for novel degrees of freedom in designing optically resonant nanophotonic structures down to the atomic scale, from the precise stacking of vertical heterostructures to controlling the twist angle between crystallographic axes. Specifically, while transition metal dichalcogenides monolayers exhibit giant second order nonlinear responses, their bulk counterparts with 2H stacking have zero second order response. In this work, we show second harmonic generation (SHG) arising from the interface of WS$_2$/MoS$_2$ hetero-bilayer thin films with an additional SHG enhancement in nanostructured optical antennas mediated by both the excitonic resonances and the anapole condition. When both conditions are met, we observe up to $10^2$ SHG signal enhancement. Our results highlights vdW materials as a platform for designing unique multilayer optical nanostructures and metamaterial, paving the way for advanced applications in nanophotonics and nonlinear optics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_06156 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Interface second harmonic generation enhancement in hetero-bilayer van der Waals nanoantennas Tognazzi, Andrea Franceschini, Paolo Biechteler, Jonas Baù, Enrico Cino, Alfonso Carmelo Tittl, Andreas De Angelis, Costantino Sortino, Luca Optics Mesoscale and Nanoscale Physics Layered van der Waals (vdW) materials have emerged as a promising platform for nanophotonics due to large refractive indexes and giant optical anisotropy. Unlike conventional dielectrics and semiconductors, the absence of covalent bonds between layers allows for novel degrees of freedom in designing optically resonant nanophotonic structures down to the atomic scale, from the precise stacking of vertical heterostructures to controlling the twist angle between crystallographic axes. Specifically, while transition metal dichalcogenides monolayers exhibit giant second order nonlinear responses, their bulk counterparts with 2H stacking have zero second order response. In this work, we show second harmonic generation (SHG) arising from the interface of WS$_2$/MoS$_2$ hetero-bilayer thin films with an additional SHG enhancement in nanostructured optical antennas mediated by both the excitonic resonances and the anapole condition. When both conditions are met, we observe up to $10^2$ SHG signal enhancement. Our results highlights vdW materials as a platform for designing unique multilayer optical nanostructures and metamaterial, paving the way for advanced applications in nanophotonics and nonlinear optics. |
| title | Interface second harmonic generation enhancement in hetero-bilayer van der Waals nanoantennas |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2411.06156 |