A Surface Impedance-Based Three-Channel Acoustic Metasurface Retroreflector
arXiv:1803.01194 · doi:10.1063/1.5025481
Abstract
We propose the design and measurement of an acoustic metasurface retroreflector that works at three discrete incident angles. An impedance model is developed such that for acoustic waves impinging at -60 degrees, the reflected wave is defined by the surface impedance of the metasurface, which is realized by a periodic grating. At 0 and 60 degrees, the retroreflection condition can be fulfilled by the diffraction of the surface. The thickness of the metasurface is about half of the operating wavelength and the retroreflector functions without parasitic diffraction associated with conventional gradient-index metasurfaces. Such highly efficient and compact retroreflectors open up possibilities in metamaterial-based acoustic sensing and communications.
arXiv comment10 pages, 6 figures
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Cited by in corpus (6)
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- Perfect anomalous splitter by acoustic meta-grating
- Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings
- Switchable bifunctional metasurfaces: nearly perfect retroreflection and absorption at THz regime
- Multiphysics metamirrors for simultaneous manipulations of acoustic and electromagnetic waves
- Coherent Retroreflective Metasurfaces