Fig. 2: Electrical response.
From: GHz acousto-optic angular momentum with tunable topological charge
a Simulated mechanical displacement (Δz, in log-scale) originating from a circular BAWR in a 2D, azimuthally symmetric cell. b Experimental electrical reflection (corresponding to the S11 rf-scattering parameters) of the BAWR in a limited frequency range, highlighting the 13 MHz separated dips corresponding to substrate resonances. c Simulated and d experimental phase profile around the path γc of Fig. 1g, evaluated precisely at one of the substrate resonances in panel (b) (on-peak) and far from them (off-peak). The dots are experimental points, with the solid line representing an average. The phase excursion decreases at the resonance frequency in both simulation and experiment.
