Abstract
Acoustic metasurfaces are thin, engineered structures that can control the local reflection and transmission coefficients of acoustic waves. Here, we describe our recent framework on general impedance matching with bianisotropic metasurfaces, in which elements are designed to control the local asymmetric impedance matrix. Compared with conventional quarter wavelength impedance matching layers, our proposed metasurface, with arbitrary thickness, can maximize wave transmission through an arbitrary layer with controlled phase. As a showcase, we demonstrate the design of a metasurface that helps ultrasound in water to penetrate a steel plate with almost 100% power efficiency and controlled transmission phase, which is beyond what is possible with conventional impedance matching layers. Our approach also applies to electromagnetic scenarios to help waves transmitting through walls or even metal plates.
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