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Area of Science:

  • Acoustics and Materials Science
  • Metasurface Engineering

Background:

  • Metasurfaces are effective, compact devices for arbitrary wavefront design.
  • They are planar metamaterials with subwavelength thickness enabling wavefront shaping via in-plane spatial variations.
  • Acoustic metasurfaces offer unique possibilities for manipulating sound waves.

Purpose of the Study:

  • To introduce a novel class of acoustic gradient-index (GRIN) metasurfaces.
  • To demonstrate broadband ultrasonic 3D wavefront shaping capabilities in water.
  • To explore potential applications in fields requiring designed ultrasonic fields.

Main Methods:

  • Engineering soft, graded-porous silicone rubber with a high acoustic index.
  • Fabricating planar metasurfaces with controlled spatial variations in acoustic properties.
  • Conducting experimental validations for beam steering, focusing, and vortex beam generation.

Main Results:

  • Successful fabrication of soft GRIN metasurfaces.
  • Demonstration of broadband ultrasonic 3D wavefront shaping.
  • Experimental evidence of beam steering, focusing, and vortex beam generation in free space.

Conclusions:

  • The developed GRIN metasurfaces are effective for broadband ultrasonic wavefront shaping.
  • Their straightforward fabrication using polymer science engineering facilitates practical applications.
  • Potential applications include biomedical imaging, non-destructive testing, and particle manipulation.