Fig. 1: Acousto-optical generation of chiral optical beams.
From: GHz acousto-optic angular momentum with tunable topological charge
a Device concept. A properly engineered bulk acoustic wave resonator (BAWR) launches an acoustic vortex into the substrate and modulates in time the OAM of a reflected optical beam. The BAWR is engineered starting from a circular contact (with the expected acoustic field sketched in (b)) that is perturbed into a spiral (expected field sketched in (c)). d, e Experimental amplitude and phase map of a vortex with ℓ = 3 at 1.139 GHz. f, g Simulated maps for the same drive and device geometry extracted from full, 3D simulations.
