Nonlinear Terahertz Resonances from Ballistic Electron Funnelling
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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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| _version_ | 1866909597332144128 |
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| author | Do, Hue T. B. Ngirmang, Gregory K. Lin, Wu Bosman, Michel |
| author_facet | Do, Hue T. B. Ngirmang, Gregory K. Lin, Wu Bosman, Michel |
| contents | We introduce a new mechanism for second-harmonic generation through geometrically rectifying-funneling-ballistic electrons in THz optical resonators. Our resonant rectifiers inherently act as second-order harmonic generators, rectifying currents without the presence of a potential barrier. Particle-in-cell simulations reveal that femtosecond electron-surface scattering plays a critical role in this process. We differentiate electron funneling from nonlocal plasmonic drag and bulk Dirac anharmonicity, showing that funneling can reduce the required field intensity for second-harmonic generation by 3-4 orders of magnitude. We provide design guidelines for generating funneling-induced second-harmonic generation, including resonance mode matching and materials selection. This approach offers a practical pathway for low-field, geometrically tunable THz upconversion and rectification, operating from sub-10 THz to multiple tens of THz in graphene. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_09212 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nonlinear Terahertz Resonances from Ballistic Electron Funnelling Do, Hue T. B. Ngirmang, Gregory K. Lin, Wu Bosman, Michel Mesoscale and Nanoscale Physics Optics We introduce a new mechanism for second-harmonic generation through geometrically rectifying-funneling-ballistic electrons in THz optical resonators. Our resonant rectifiers inherently act as second-order harmonic generators, rectifying currents without the presence of a potential barrier. Particle-in-cell simulations reveal that femtosecond electron-surface scattering plays a critical role in this process. We differentiate electron funneling from nonlocal plasmonic drag and bulk Dirac anharmonicity, showing that funneling can reduce the required field intensity for second-harmonic generation by 3-4 orders of magnitude. We provide design guidelines for generating funneling-induced second-harmonic generation, including resonance mode matching and materials selection. This approach offers a practical pathway for low-field, geometrically tunable THz upconversion and rectification, operating from sub-10 THz to multiple tens of THz in graphene. |
| title | Nonlinear Terahertz Resonances from Ballistic Electron Funnelling |
| topic | Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2411.09212 |