Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 33, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202203109
Keywords
bioinspired metaskins; lotus effect; mechanical stimuli; self-assembled nanosurfaces; structured ultrasound
Categories
Funding
- National Key R&D Program of China [2020YFA0211400, 2020YFA0211401]
- National Natural Science Foundation of China [12022410]
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Metasurfaces of subwavelength thicknesses can manipulate acoustic waves, and multistructured underwater ultrasound can be generated through self-assembly deposition, enabling low-threshold and contactless behavior control.
Metasurfaces of the subwavelength thicknesses provide a distinctive route for acoustic wave manipulation. Based on the advanced 3D printing, those judiciously designed 2D metamaterials enable intriguing effects such as abnormal reflection, transmission, and absorption. However, acoustic metasurfaces, with strong wave-structure interactions in subwavelength scales, have encountered a big challenge of being acoustically transparent due to the insufficient impedance mismatch underwater. Here, reconfigurable bioinspired metaskin patterning for generating multistructured waterborne ultrasound is proposed. The nanostructured metaskin exhibits the lotus effect, with the thickness of only 70 mu m (approximate to 1/20 wavelength at 1 MHz) and a tremendous impedance mismatch (approximate to 0.0001 transmission) for ultrasound. By depositing the strippable metaskins via self-assembly into different patterns, the focusing, the vortex, and the Talbot structured ultrasound beams are implemented, respectively. The multistructured ultrasound has the patterned intensity fields of energy redistribution, where even weak field enhancement at low frequencies can activate the living organisms directly without using microbubbles, which enables low-threshold and contactless behavior control via the mechanical stimulus.
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