Fig. 1: Essential concept of the acoustic-actuated topological defect.
From: Harnessing acoustic topology for dynamic control of liquid crystal defects
a Schematic of the acoustic device with two orthogonal pairs of interdigital transducers (IDTs) generating standing surface acoustic wave (SSAWs), enabling precise control over the defect array. b Schematic of the mechanism of interaction between the acoustic wave and the fluid medium, illustrating the generation of acoustic streaming. The inset depicts LC molecular reorientation induced by streaming-driven forces. c Illustration of parameter modulation (amplitude, frequency, and phase) of acoustic waves, allowing the generation of various soft lattice structures for manipulating topological defects. d Spin vector field of the acoustic velocity exhibiting meron-type topological textures. Shown are the intensity distribution of the acoustic pressure field (bottom) and the corresponding acoustic spin orientation distribution at the pressure antinode center (top). e Acoustic velocity spin component distribution along the z-axis, and f in the xy plane. g LC director configuration at the core of a topological defect viewed along the z-axis and h corresponding director distribution in the xy plane.
