Apparent Negative Reflection with the Gradient Acoustic Metasurface by Integrating Supercell Periodicity into the Generalized Law of Reflection

• DOI: 10.1038/srep38314
• Publication Date: 2016-12-05T10:20:49Z
• Authors: Bingyi Liu; Wenyu Zhao; Yongyuan Jiang
• Keywords: Reflection; Supercell; Snell's law

Abstract As the two dimensional version of functional wavefront manipulation metamaterial, metasurface has become a research hot spot for engineering at will with subwavelength thickness. The wave scattered by gradient metasurface, which is composed periodic supercells, governed generalized Snell’s law. However, critical angle that derived from law circles domain incident angles allow occurrence anomalous reflection and refraction, no free space scattering waves could exist when beyond angle. Here we theoretically demonstrate apparent negative can be realized acoustic underlying mechanism understood as higher order diffraction arising interaction between local phase modulation non-local effects introduced supercell periodicity. phenomena been perfectly verified calculated reflected metasurface. This work may provide new freedom in designing signal devices, such isolator illusion device.