Photonic and phononic modes in acoustoplasmonic toroidal nanopropellers
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929392341483520 |
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| author | de Larrinzar, Beatriz Castillo López García, Jorge M. Lanzillotti-Kimura, Norberto Daniel García-Martín, Antonio |
| author_facet | de Larrinzar, Beatriz Castillo López García, Jorge M. Lanzillotti-Kimura, Norberto Daniel García-Martín, Antonio |
| contents | Non-conventional resonances, both acoustic and photonic, are found in metallic particles with a toroidal nanopropeller geometry that is generated by sweeping a three-lobed 2D-shape along a spiral with twisting angle, $α$. For both optical and acoustic cases, spectral location of resonances experiences a red-shift as a function of $α$. We demonstrate that the optical case can be understood as a natural evolution of resonances as the spiral length of the toroidal nanopropeller increases with $α$, implying a huge helicity dependent absorption cross section. In the case of acoustic response, two red-shifting breathing modes are identified. Additionally, even small $α$ allows the appearance of new low-frequency resonances, whose spectral dispersion depends on a competition between length of the generative spiral and the pitch of the toroidal nanopropeller. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14331 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Photonic and phononic modes in acoustoplasmonic toroidal nanopropellers de Larrinzar, Beatriz Castillo López García, Jorge M. Lanzillotti-Kimura, Norberto Daniel García-Martín, Antonio Optics Mesoscale and Nanoscale Physics Non-conventional resonances, both acoustic and photonic, are found in metallic particles with a toroidal nanopropeller geometry that is generated by sweeping a three-lobed 2D-shape along a spiral with twisting angle, $α$. For both optical and acoustic cases, spectral location of resonances experiences a red-shift as a function of $α$. We demonstrate that the optical case can be understood as a natural evolution of resonances as the spiral length of the toroidal nanopropeller increases with $α$, implying a huge helicity dependent absorption cross section. In the case of acoustic response, two red-shifting breathing modes are identified. Additionally, even small $α$ allows the appearance of new low-frequency resonances, whose spectral dispersion depends on a competition between length of the generative spiral and the pitch of the toroidal nanopropeller. |
| title | Photonic and phononic modes in acoustoplasmonic toroidal nanopropellers |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.14331 |