Reflected wavefront manipulation based on ultrathin planar acoustic metasurfaces

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,…

• NN
  National Natural Science Foundation of China

  Awards: 11222442, 81127901, 11174138, 11174139, 2010CB327803 and 2012CB921504, 11174138, 11174139, 11222442, 81127901, and 11274168, 11274168
• PA
  Priority Academic Program Development of Jiangsu Higher Education Institutions
• PF
  Program for New Century Excellent Talents in University

  Awards: NCET-12-0254, 12-0254
• NK
  National Key Research and Development Program of China

  Awards: 2010CB327803 and 2012CB921504, 2010CB327803, 2012CB921504