Using parity transformation in metamaterial design to create parity metamaterials, for ultrabroadband transmission with tunable reflection
"parity metamaterials are constructed by pairing arbitrary asymmetric meta-atoms with their unique parity-inverted counterparts, maintaining undistorted transmitted wavefront across ultrabroad frequencies while simultaneously allowing for flexible control of reflected wavefronts... integrated into sonar systems, significantly suppress specular reflection signals, achieving acoustic stealth... does not rely on global symmetry/ balanced gain–loss conditions... underwater acoustics, elastic waves, adaptive metasurfaces"
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