Anomalous reflection of acoustic waves using local resonant metamaterials
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The emerging acoustic metamaterials which contain subwavelength structures, has gained a lot interest in recent year for manipulating the waves. In this work we make use of the properties of locally resonant acoustic metamaterials (LRAMs), wherein by precisely modulating the phase of the LRAM, the direction of reflected wave can be altered. Targeting low frequency regime and centimeter sized unit cells, numerical simulations were performed to demonstrate the concept of negative reflection of acoustic waves. This work opens up new avenues for the design of metasurfaces in medical ultrasound guiding procedures, specifically addressing reflection angle aspects. REFERENCES [1] B. Assouar, B. Liang, Y. Wu, Y. Li, J.-C. Cheng, Y. Jing, Acoustic metasurfaces. Nat Rev Mater, Vol. 3, pp. 460-–472, 2018. [2] Liu, Z., Zhang, X., Mao, Y., Zhu, Y., Yang, Z., Chan, C., Sheng, P., “Locally resonant sonic materials”, Science, 289, 1734–1736 (2000). [3] Sridhar, A., Kouznetsova, V.G. & Geers, M.G.D. “Homogenization of locally resonant acoustic metamaterials towards an emergent enriched continuum”, Comput Mech 57, 423–435 (2016).
