Metamaterials exhibiting Fabry–Pérot resonances are shown to achieve ultrasonic imaging of a sub-wavelength aperture in water immersion across a broad bandwidth. Holey-structured metamaterials of different thickness were additively manufactured using a tungsten substrate and selective laser melting, tungsten being chosen so as to create a significant acoustic impedance mismatch with water. Both broadband metamaterial behavior and sub-wavelength imaging in water are demonstrated experimentally and validated with finite element simulations over the 200–300 kHz range.

中文翻译：

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用于水中宽带超声亚波长成像的多孔结构钨超材料

显示出法布里-珀罗共振的超材料可在宽带宽的水浸中实现亚波长孔径的超声成像。不同厚度的孔结构超材料是使用钨基板和选择性激光熔化增材制造的，选择钨是为了与水产生显着的声阻抗失配。水中的宽带超材料行为和亚波长成像均通过实验证明，并通过 200-300 kHz 范围内的有限元模拟进行验证。