Abstract
Plane waves are required for underwater acoustic locating, navigation, and survey, but generating them efficiently with traditional approaches is impractical, particularly at low frequencies. This study proposes an easy means to transform cylindrical waves into plane waves, through phase rectification with graded aluminum honeycomb structures. The honeycomb metasurface allows mimicking of the acoustic behavior of fluids, and its effective acoustic index and impedance can be independently tailored as desired. Experiment verifies efficient wave-front modulation of the metasurface with high transmission over a broad frequency range.
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