Coherent Acoustic Phonons in Plasmonic Nanoparticles: Elastic Properties and Dissipation at Low Temperatures
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| _version_ | 1866911948570886144 |
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| author | Boggiano, Hilario D. Possmayer, Thomas Morguet, Luis Nan, Lin Sortino, Luca Maier, Stefan A. Cortés, Emiliano Grinblat, Gustavo Bragas, Andrea V. Menezes, Leonardo de S. |
| author_facet | Boggiano, Hilario D. Possmayer, Thomas Morguet, Luis Nan, Lin Sortino, Luca Maier, Stefan A. Cortés, Emiliano Grinblat, Gustavo Bragas, Andrea V. Menezes, Leonardo de S. |
| contents | We studied the frequency and quality factor of mechanical plasmonic nanoresonators as a function of temperature, ranging from ambient to 4 K. Our investigation focused on individual gold nanorods and nanodisks of various sizes. We observed that oscillation frequencies increase linearly as temperature decreases until saturation is reached at cryogenic temperatures. This behavior is explained by the temperature dependence of the elastic modulus, with a Debye temperature compatible with reported bulk values for gold. To describe the behavior of the quality factor, we developed a model considering the nanostructures as anelastic solids, identifying a dissipation peak around 150 K due to a thermally activated process, likely of the Niblett-Wilks mechanism type. Importantly, our findings suggest that external dissipation factors are more critical to improving quality factors than internal friction, which can be increased by modifying the nanoresonator's environment. Our results enable the design of structures with high vibration frequencies and quality factors by effectively controlling external losses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06180 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coherent Acoustic Phonons in Plasmonic Nanoparticles: Elastic Properties and Dissipation at Low Temperatures Boggiano, Hilario D. Possmayer, Thomas Morguet, Luis Nan, Lin Sortino, Luca Maier, Stefan A. Cortés, Emiliano Grinblat, Gustavo Bragas, Andrea V. Menezes, Leonardo de S. Optics Applied Physics We studied the frequency and quality factor of mechanical plasmonic nanoresonators as a function of temperature, ranging from ambient to 4 K. Our investigation focused on individual gold nanorods and nanodisks of various sizes. We observed that oscillation frequencies increase linearly as temperature decreases until saturation is reached at cryogenic temperatures. This behavior is explained by the temperature dependence of the elastic modulus, with a Debye temperature compatible with reported bulk values for gold. To describe the behavior of the quality factor, we developed a model considering the nanostructures as anelastic solids, identifying a dissipation peak around 150 K due to a thermally activated process, likely of the Niblett-Wilks mechanism type. Importantly, our findings suggest that external dissipation factors are more critical to improving quality factors than internal friction, which can be increased by modifying the nanoresonator's environment. Our results enable the design of structures with high vibration frequencies and quality factors by effectively controlling external losses. |
| title | Coherent Acoustic Phonons in Plasmonic Nanoparticles: Elastic Properties and Dissipation at Low Temperatures |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2407.06180 |