Performance improvement of focused acoustic-vortex tweezers constructed by a hyperboloidal acoustic lens and a circular array

Novel phononic-crystal-arrayed acoustic metalens for long beam focusing in multi-band

“…[13][14][15][16][17][18] A significant challenge that has yet to be achieved in both theoretical models and experimental validation is to achieve long beam projection of lowfrequency-band acoustic waves with long wavelengths, similar to active parameter control, through the smallest possible metastructures. [19][20][21][22][23] This letter introduces a novel theoretical method for designing a two-dimensional acoustic metalens by means of multiple scattering theory. The proposed approach is validated through both finite element simulations and experimental verification.…”