Fabry-Pérot ultrasonic metamaterials have been additively manufactured using laser powder bed fusion to contain subwavelength holes with a high aspect-ratio of width to depth. Such metamaterials require the acoustic impedance mismatch between the structure and the immersion medium to be large. It is shown for the first time that metallic structures fulfil this criterion for applications in water over the 200–800 kHz frequency range. It is also demonstrated that laser powder bed fusion is a flexible fabrication method for the ceration of structures with different thicknesses, hole geometry and tapered openings, allowing the acoustic properties to be modified. It was confirmed via both finite element simulation and practical measurements that these structures supported Fabry-Pérot resonances, needed for metamaterial operation, at ultrasonic frequencies in water. It was also demonstrated the the additively-manufactured structures detected the presence of a sub-wavelength slit aperture in water.

Fabry-Pérot超声超材料已经使用激光粉末床熔合法进行了增材制造，以包含宽度与深度的高纵横比高的亚波长孔。这种超材料要求结构与浸入介质之间的声阻抗失配较大。首次表明金属结构在200–800 kHz频率范围内的水中应用符合该标准。还证明了激光粉末床熔合是一种灵活的制造方法，用于对具有不同厚度，孔几何形状和锥形开口的结构进行贴合，从而可以改变声学特性。通过有限元模拟和实际测量结果证实，这些结构支持超材料操作所需的Fabry-Pérot共振，在水中以超声波频率。还证明了添加制造的结构检测到水中存在亚波长狭缝孔。