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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.04470 |
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| _version_ | 1866917790156324864 |
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| author | De Tullio, Matteo Inverardi, Giovanni Novi Karam, Michella Houard, Jonathan Ropitaux, Marc Blum, Ivan Carnovale, Francesco Lattanzi, Gianluca Taioli, Simone Eriksson, Gustav Hulander, Mats Andersson, Martin Vella, Angela Morresi, Tommaso |
| author_facet | De Tullio, Matteo Inverardi, Giovanni Novi Karam, Michella Houard, Jonathan Ropitaux, Marc Blum, Ivan Carnovale, Francesco Lattanzi, Gianluca Taioli, Simone Eriksson, Gustav Hulander, Mats Andersson, Martin Vella, Angela Morresi, Tommaso |
| contents | This study investigates the emission of cations from silica samples by single-cycle THz pulses, focusing on the influence of pulse polarity. Negative THz pulses were found to efficiently trigger the evaporation of cations from nanoneedles in amorphous silica samples compared to positive pulses. Conversely, this dependence on pulse polarity could not be found in samples with metallic behaviour such as LaB$_6$ and when multi-cycle pulses in different frequency ranges such as ultraviolet (UV) are used. First-principles simulations focus on silica under THz laser irradiation and show critical fields for ion evaporation of hydroxyl groups from Si(OH)$_4$, which serves as a model precursor molecule for the amorphous solid matrix. To explain our experimental results, we propose a simplified theoretical model that determines the role of the polarity of the THz pulse by taking into account the differences in electron mobility between silica and semi-metallic samples. The study explores the nonlinear microscopic mechanisms of atomic evaporation under external static and THz laser fields and clarifies the dynamics of THz-enhanced APT and related applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_04470 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evaporation of cations from non-conductive nano-samples using single-cycle THz pulses: an experimental and theoretical study De Tullio, Matteo Inverardi, Giovanni Novi Karam, Michella Houard, Jonathan Ropitaux, Marc Blum, Ivan Carnovale, Francesco Lattanzi, Gianluca Taioli, Simone Eriksson, Gustav Hulander, Mats Andersson, Martin Vella, Angela Morresi, Tommaso Materials Science Atomic and Molecular Clusters This study investigates the emission of cations from silica samples by single-cycle THz pulses, focusing on the influence of pulse polarity. Negative THz pulses were found to efficiently trigger the evaporation of cations from nanoneedles in amorphous silica samples compared to positive pulses. Conversely, this dependence on pulse polarity could not be found in samples with metallic behaviour such as LaB$_6$ and when multi-cycle pulses in different frequency ranges such as ultraviolet (UV) are used. First-principles simulations focus on silica under THz laser irradiation and show critical fields for ion evaporation of hydroxyl groups from Si(OH)$_4$, which serves as a model precursor molecule for the amorphous solid matrix. To explain our experimental results, we propose a simplified theoretical model that determines the role of the polarity of the THz pulse by taking into account the differences in electron mobility between silica and semi-metallic samples. The study explores the nonlinear microscopic mechanisms of atomic evaporation under external static and THz laser fields and clarifies the dynamics of THz-enhanced APT and related applications. |
| title | Evaporation of cations from non-conductive nano-samples using single-cycle THz pulses: an experimental and theoretical study |
| topic | Materials Science Atomic and Molecular Clusters |
| url | https://arxiv.org/abs/2403.04470 |