Article Dans Une Revue Nanomaterials Année : 2024

Photonic and Nanomechanical Modes in Acoustoplasmonic Toroidal Nanopropellers

Résumé

Non-conventional resonances, both acoustic and photonic, are found in metallic particles with a toroidal nanopropeller geometry, which is generated by sweeping a three-lobed 2D shape along a spiral with twisting angle α. For both optical and acoustic cases, the 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 a small α allows the appearance of new low-frequency resonances, whose spectral dispersion depends on a competition between the length of the generative spiral and the pitch of the toroidal nanopropeller.

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hal-04784183 , version 1 (14-11-2024)

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Beatriz Castillo López de Larrinzar, Jorge M García, Norberto Daniel Lanzillotti-Kimura, Antonio García-Martín. Photonic and Nanomechanical Modes in Acoustoplasmonic Toroidal Nanopropellers. Nanomaterials, 2024, 14, pp.1276. ⟨10.3390/nano14151276⟩. ⟨hal-04784183⟩
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