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Champ diffusé spiralé d'une onde plane acoustique évanescente incidente sur une particule de Mie
Language
EN
Communication dans un congrès avec actes
This item was published in
The Anglo-French Physical Acoustics Conference (AFPAC) 2020, Anglo-French Physical Acoustics Conference 2020, 2020-01, Sanderstead. 2021, vol. 1761, p. 012003
IOP Publishing
English Abstract
We consider theoretically the scattering of an incident evanescent plane wave by
a spherical particle. The scattering problem is treated in a classic way by applying the T-
matrix formalism and the resulting field is ...Read more >
We consider theoretically the scattering of an incident evanescent plane wave by
a spherical particle. The scattering problem is treated in a classic way by applying the T-
matrix formalism and the resulting field is expressed on the basis of the different vibration
modes of the particle. Compared to the case of a homogeneous plane incident wave, additional
azimuthal scattered modes are excited and their contribution provokes a symmetry breaking of
the field. Importantly, if a mode is preferentially excited by choosing the corresponding reduced
frequency, the scattered radiation exhibits a spiral structure. The scattered field has a rotating
phase around the scatterer which comes from the formation of spiral scattered waves and this
effect is accentuated by increasing the evanescence degree of the incident wave. These results
could have important implications for the contactless manipulation of objects with acoustic
radiation forces and torques.Read less <