Deep-subwavelength control of acoustic waves in an ultra-compact metasurface lens.

ABSTRACT: Space-coiling acoustic metasurfaces have been largely exploited and shown their outstanding wave manipulation capacity. However, they are complex in realization and cannot directly manipulate acoustic near-fields by controlling the effective path length. Here, we propose a comprehensive paradigm for acoustic metasurfaces to extend the wave manipulations to both far- and near-fields and markedly reduce the implementation complexity with a simple structure, which consists of an array of deep-subwavelength-spaced slits perforated in a thin plate. A semi-analytical approach for such a design is established using a microscopic coupled-wave model, which reveals that the acoustic diffractive pattern at every slit exit is the sum of the initial transmission and the secondary scatterings of the cou

SUBMITTER: Chen J 

PROVIDER: S-EPMC6250707 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature