Reflected wavefront manipulation based on ultrathin planar acoustic metasurfaces.

TitleReflected wavefront manipulation based on ultrathin planar acoustic metasurfaces.
Publication TypeJournal Article
Year of Publication2013
AuthorsLi Y, Liang B, Gu Z-M, Zou X-Y, Cheng J-C
JournalScientific reports
Volume3
Pagination2546
Date Published2013
Abstract

The introduction of metasurfaces has renewed the Snell's law and opened up new degrees of freedom to tailor the optical wavefront at will. Here, we theoretically demonstrate that the generalized Snell's law can be achieved for reflected acoustic waves based on ultrathin planar acoustic metasurfaces. The metasurfaces are constructed with eight units of a solid structure to provide discrete phase shifts covering the full 2π span with steps of π/4 by coiling up the space. By careful selection of the phase profiles in the transverse direction of the metasurfaces, some fascinating wavefront engineering phenomena are demonstrated, such as anomalous reflections, conversion of propagating waves into surface waves, planar aberration-free lens and nondiffracting Bessel beam generated by planar acoustic axicon. Our results could open up a new avenue for acoustic wavefront engineering and manipulations.

DOI10.3389/fnins.2013.00151
Alternate JournalSci Rep