Super-narrow focusing and ultra-long working distance by different shapes of dielectric microlenses

Liquid–liquid core–shell configurable mesoscale spherical acoustic lens with subwavelength focusing

“…In order to provide additional control on the acoustic jet focusing profile, the effect of the lens geometry has also been considered [30][31][32] . When the lens inner liquid is immiscible with the host medium, the geometry of the acoustic lens can be dynamically modified by introducing a certain amount of the host medium liquid inside the lens.…”

“…In order to provide additional control on the acoustic jet focusing profile, the effect of the lens geometry has also been considered. [30][31][32] When the lens inner liquid is immiscible with the host medium, the geometry of the acoustic lens can be dynamically modified by introducing a certain amount of the host medium liquid inside the lens. Neglecting the thickness of the sphere, the resulting structure behaves as a truncated spherical lens, where the size of the truncated section depends on the amount of host medium introduced inside the lens.…”