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Research into the orbital angular momentum carried by helical wave-fronts hasbeen dominated by the fields of electromagnetism and acoustics, owing to itspractical utility in sensing, communication and tweezing. Despite the hugeresearch effort across the wave community, only recently has elastic orbitalangular momentum been theoretically shown to exhibit similar properties. Herewe experimentally observe the transfer of elastic orbital angular momentum froma hollow elastic pipe to a fluid in which the pipe is partially submerged, inan elastic analogue of Durnin's slit-ring experiment for optical beams. Thistransfer is achieved by coupling the dilatational component of guided flexuralwaves in the pipe with the pressure field in the fluid; the circumferentialdistribution of the normal stress in the pipe acts as a continuous phasedpressure source in the fluid resulting in the generation of Bessel-likeacoustic beams. This demonstration has implications for future research into anew regime of orbital angular momentum for elastic waves, as well providing anew method to excite acoustic beams that carry orbital angular momentum thatcould create a new paradigm shift for acoustic tweezing.

Observation of Elastic Orbital Angular Momentum Transfer: Coupling Flexural Waves in Partially Submerged Pipes to Acoustic Waves in Fluids