Spatiotemporal characteristics of magneto-acousto-electric fields generated by Bessel beams

•A new MAE model is established based on the coupling of helical wave fronts of Bessel beams in a coaxial toroidal magnet.•The MAE field induced by the Bessel beam of lth order is determined by those of (l-1)th and (l + 1)th orders.•The center-converging rotary MAE field with a constant peak-intensity at the center can only be constructed by the Bessel beam of 1st order.•The MAE field may advance a new synergistic stimulation strategy assisted by center-captured drug particles, with improved accuracy and reduced acoustic energy. The magneto-acousto-electric (MAE) effect shows great significance in neural modulation, whereas the high-precision stimulation cannot be realized by the unidirectional electric distribution perpendicular to the orthogonal acoustic and magnetic fields. A new MAE model is established based on helical wave fronts of Bessel beams in a coaxial magnetic field. Numerical and experimental studies are conducted for quasi-Bessel beams constructed by the saw-tooth phase modulation for a sectorial planar transducer array in a coaxial toroidal magnet. The MAE field induced by the Bessel beam of lth order is determined by those of (l-1)th and (l + 1)th orders. The rotary MAE field with a constant peak-intensity center can only be constructed by the Bessel beam of 1st order, which is effective for neural stimulation. Assisted by therapeutic effects of center-captured drug particles by acoustic-vortex tweezers, the center-converging MAE field may advance a new collaborative stimulation strategy with improved accuracy and reduced acoustic energy.