Abstract
We theoretically demonstrate that full-angle negative reflection can be realized by the gradient acoustic metasurface with a specific surface phase gradient value. A straightforward physical picture is presented here to understand such anomalous phenomena by considering the influence of the non-local effect that originates from the supercell periodicity on the gradient metasurface. Basing on the generalized law of reflection which is modified by a reciprocal lattice vector term, the negative reflection that beyond the critical angle is possible. In this paper, we utilize the coiling-up space structures of deep subwavelength geometrical scale to construct the desired gradient acoustic metasurface and observe the apparent full-angle negative reflection phenomenon. The present work enriches the content of the generalized law of reflection and provide new design methodology for functional acoustic wave modulation devices, such like directional ground acoustic cloaking and acoustic isolation devices.
Highlights
In recent years, metasurface has become a research hot spot due to its novel characteristics shown in wavefront manipulation
Basing on the appropriately designed subwavelength structures, metasurface is able to be fashioned into a compact planar profile of the subwavelength thickness and tailors the scattered wavefront into arbitrary desired shape, such as ultra-thin planar lens,[2,3] vortex beam generator,[1,4] holograms[5,6] and surface cloaking.[7,8]. Besides these numerous functional wavefront manipulation devices that realized by the metasurface, metasurface itself can be applied as a good platform to study some nontrivial phenomenon, for example, the anomalous reflection and refraction that takes place at a gradient metasurface and optical Spin Hall effect[9,10] to name a few
According to the generalized law of reflection and refraction, the negative reflection and negative refraction could exist within a limited range of incident angles, which means the incident beam and the scattered beam would locate at the same side of the normal line
Summary
Metasurface has become a research hot spot due to its novel characteristics shown in wavefront manipulation. Full-angle negative reflection realized by a gradient acoustic metasurface
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