GHz acousto-optic angular momentum with tunable topological charge

A. Pitanti (), N. Ashurbekov, I. dePedro-Embid, M. Msall and P. V. Santos ()
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A. Pitanti: Leibniz-Institut im Forschungsverbund Berlin e. V.
N. Ashurbekov: Leibniz-Institut im Forschungsverbund Berlin e. V.
I. dePedro-Embid: Leibniz-Institut im Forschungsverbund Berlin e. V.
M. Msall: Leibniz-Institut im Forschungsverbund Berlin e. V.
P. V. Santos: Leibniz-Institut im Forschungsverbund Berlin e. V.

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Controlling the symmetry of optical and mechanical waves is pivotal to their full exploitation in technological applications and topology-linked fundamental physics experiments. Leveraging on the control of orbital angular momentum, we introduce here a device forming acoustic vortices which can impart an orbital angular momentum modulation at super-high-frequency on reflected light beams. Originated by shape-engineering of a single-contact bulk acoustic wave resonator, acoustic vortices are generated in a wide band of frequencies around 4 GHz with topological charge ranging from 1 to beyond 13 tunable by the device geometry and/or excitation frequency. With all electrical control and on-chip integration our device offers compact solutions for angular-momentum-based light communication, three-dimensional particle manipulation, as well as alternative interaction schemes for optomechanical devices.

Date: 2025
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DOI: 10.1038/s41467-025-63362-w

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