title: Taming the degeneration of Bessel beams at an anisotropic-isotropic interface: Toward three-dimensional control of confined vortical waves.
abstract: Despite their self-reconstruction properties in heterogeneous media, Bessel beams are known to degenerate when they are refracted from an isotropic to an anisotropic medium. In this paper, we study the converse situation wherein an anisotropic Bessel beam is refracted into an isotropic medium. It is shown that these anisotropic Bessel beams also degenerate, leading to confined vortical waves that may serve as localized particle trap for acoustical tweezers. The linear nature of this degeneration allows the three-dimensional control of this trap position by wavefront correction. Theory is confronted to experiments performed in the field of acoustics. A swirling surface acoustic wave is synthesized at the surface of a piezoelectric crystal by a microelectromechanical integrated system and radiated inside a miniature liquid vessel. The wavefront correction is operated with inverse filter technique. This work opens perspectives for contactless on-chip manipulation devices.
authors.affiliation: Institut d'Electronique, de Microélectronique et Nanotechnologie (IEMN), LIA LICS, Université Lille 1 and EC Lille, CNRS UMR 8520, 59652 Villeneuve d'Ascq, France.|Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588, Institut des NanoSciences de Paris (INSP), F-75005 Paris, France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Riaud
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588, Institut des NanoSciences de Paris (INSP), F-75005 Paris, France.
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Thomas
authors.affiliation: Institut d'Electronique, de Microélectronique et Nanotechnologie (IEMN), LIA LICS, Université Lille 1 and EC Lille, CNRS UMR 8520, 59652 Villeneuve d'Ascq, France.
authors.forename: Michael
authors.initials: M
authors.lastname: Baudoin
authors.affiliation: Institut d'Electronique, de Microélectronique et Nanotechnologie (IEMN), LIA LICS, Université Lille 1 and EC Lille, CNRS UMR 8520, 59652 Villeneuve d'Ascq, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Bou Matar