LAUSR

We report broadband acoustic converging and asymmetric converging based on mono- and dual-layer thermoacoustic phased arrays of Bessel-like beams, respectively. Based on the thermoacoustic units, we design a converging lens constructed by a monolayer phased array of the Bessel-like beam and demonstrate the large converging region (16.8λ), the broad fractional bandwidth (0.77), and the design feasibility of the converging lens. Besides, by adjusting the phase distribution of the converging lens, the cylindrical acoustic source can also be converged on a large region perfectly. More importantly, we design an asymmetric converging lens by introducing dual-layer phased arrays, in which the acoustic energy can be converged on a large region at a side but cannot pass through the lens at the other side. The converging region can be manipulated by adjusting the distance between two phased arrays. The proposed lenses have the advantages of large converging region, broad bandwidth, weak diffraction, and asymmetric transmission showing excellent potential applications in acoustic devices.We report broadband acoustic converging and asymmetric converging based on mono- and dual-layer thermoacoustic phased arrays of Bessel-like beams, respectively. Based on the thermoacoustic units, we design a converging lens constructed by a monolayer phased array of the Bessel-like beam and demonstrate the large converging region (16.8λ), the broad fractional bandwidth (0.77), and the design feasibility of the converging lens. Besides, by adjusting the phase distribution of the converging lens, the cylindrical acoustic source can also be converged on a large region perfectly. More importantly, we design an asymmetric converging lens by introducing dual-layer phased arrays, in which the acoustic energy can be converged on a large region at a side but cannot pass through the lens at the other side. The converging region can be manipulated by adjusting the distance between two phased arrays. The proposed lenses have the advantages of large converging region, broad bandwidth, weak diffraction, and asymmetric ...