Airy beam-enabled binary acoustic metasurfaces for underwater ultrasound beam manipulation

A method of producing an ultrasound Airy beam for underwater ultrasound applications, comprising:

• providing a binary metasurface, wherein the binary metasurface is fabricated by:
• generating an amplitude distribution of an Airy beam at a frequency;
• converting the amplitude distribution into a binary phase profile;
• generating a 3D printing design of the binary metasurface based on the binary phase profile, wherein the binary metasurface includes ridges and grooves defined by neighboring ridges, a thickness of a ridge corresponding to a phase delay of π/2 of the Airy beam between water and a 3D-printable material;
• and
• additively manufacturing the binary metasurface with the 3D-printable material based on the 3D printing design;
• coupling the binary metasurface with a transducer configured to emit an ultrasound wave at the frequency;
• and
• producing the Airy beam by projecting the ultrasound wave towards the binary metasurface.

A binary metasurface for producing ultrasound Airy beams in underwater applications, the binary metasurface comprising:

• ridges;
• and
• grooves defined by neighboring ridges,
• wherein the binary metasurface is additively manufactured with a 3D-printable material based on a 3D printing design corresponding to a binary phase profile, a thickness of a ridge corresponding to a phase delay of π/2 between water and the 3D-printable material of an Airy beam at a frequency, and the binary phase profile is converted from an amplitude distribution of the Airy beam at the frequency.