Geometrically driven single-sided acoustic levitator using a zero-order Bessel beam

Acoustic levitation is a powerful method for the non-contact manipulation of matter. A new trapping paradigm was recently established by demonstrating stable, single-sided levitation within the high-pressure core of a zero-order Bessel beam, generated by a phased array of transducers (PAT). However, the multi-channel electronic phase control required to operate a PAT limits the technique's accessibility and cost-effectiveness. Here, inspired by multi-emitter levitators like TinyLev, we present a simplified approach that forms the necessary conical wavefront through the physical geometry of a transducer array driven from a single signal source, eliminating the need for electronic phase shifting. We demonstrate that this device generates a stable Bessel beam capable of single-sided particle trapping and manipulation in its high-pressure core. This work significantly lowers the barrier to entry for high-pressure, long-range acoustic manipulation, offering a robust and accessible platform for a wide range of research and educational applications.