Microacoustic Metagratings at Ultra-High Frequencies Fabricated by Two-Photon Lithography.

ABSTRACT: The recently proposed bianisotropic acoustic metagratings offer promising opportunities for passive acoustic wavefront manipulation, which is of particular interest in flat acoustic lenses and ultrasound imaging at ultra-high frequency ultrasound. Despite this fact, acoustic metagratings have never been scaled to MHz frequencies that are common in ultrasound imaging. One of the greatest challenges is the production of complex microscopic structures. Owing to two-photon polymerization, a novel fabrication technique from the view of acoustic metamaterials, it is now possible to precisely manufacture sub-wavelength structures in this frequency range. However, shrinking in size poses another challenge; the increasing thermoviscous effects lead to a drop in efficiency and a frequency downshift

SUBMITTER: Melnikov A 

PROVIDER: S-EPMC9284164 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature