%0 Journal Article
%T Photonic and Nanomechanical Modes in Acoustoplasmonic Toroidal Nanopropellers.
%A Castillo López de Larrinzar B
%A García JM
%A Lanzillotti-Kimura ND
%A García-Martín A
%J Nanomaterials (Basel)
%V 14
%N 15
%D 2024 Jul 29
%M 39120381
%F 5.719
%R 10.3390/nano14151276
%X 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.