title: Convert Acoustic Resonances to Orbital Angular Momentum.
abstract: We use acoustic resonances in a planar layer of half-wavelength thickness to twist wave vectors of an in-coming plane wave into a spiral phase dislocation of an outgoing vortex beam with orbital angular momentum (OAM). The mechanism is numerically and experimentally demonstrated by producing an airborne Bessel-like vortex beam. Our acoustic resonance-based OAM production differs from existing means for OAM production by enormous phased spiral sources or by elaborate spiral profiles. Our study can advance the capability of generating phase dislocated wave fields for further applications of acoustic OAM.
authors.affiliation: Collaborative Innovation Center of Advanced Microstructures and Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Xue
authors.initials: X
authors.lastname: Jiang
authors.affiliation: CNRS, Institut Jean Lamour, Vandœuvre-lès-Nancy F-54506, France and Université de Lorraine, Institut Jean Lamour, Boulevard des Aiguillettes, BP: 70239, Vandœuvre-lès-Nancy 54506, France.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Collaborative Innovation Center of Advanced Microstructures and Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liang
authors.affiliation: Collaborative Innovation Center of Advanced Microstructures and Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Jian-Chun
authors.initials: JC
authors.lastname: Cheng
authors.affiliation: Department of Physics and Center for Nonlinear Dynamics, University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Likun
authors.initials: L
authors.lastname: Zhang