Institute of Applied Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
Phys Rev Lett. 2012 Jan 6;108(1):014301. doi: 10.1103/PhysRevLett.108.014301. Epub 2012 Jan 3.
Following a theoretical proposal [M. Farhat et al., Phys. Rev. Lett. 103, 024301 (2009)], we design, fabricate, and characterize a cloaking structure for elastic waves in 1 mm thin structured polymer plates. The cloak consists of 20 concentric rings of 16 different metamaterials, each being a tailored composite of polyvinyl chloride and polydimethylsiloxane. By using stroboscopic imaging with a camera from the direction normal to the plate, we record movies of the elastic waves for monochromatic plane-wave excitation. We observe good cloaking behavior for carrier frequencies in the range from 200 to 400 Hz (one octave), in good agreement with a complete continuum-mechanics numerical treatment. This system is thus ideally suited for demonstration experiments conveying the ideas of transformation optics.
受理论方案启发[M. Farhat 等人，Phys. Rev. Lett. 103, 024301 (2009)]，我们设计、制作并测试了一种应用于 1mm 厚的结构化聚合物板中弹性波的隐身结构。该隐身结构由 20 个同心圆环组成，每个圆环由 16 种不同的超材料组成，这些超材料均为聚氯乙烯和聚二甲基硅氧烷的定制复合材料。我们使用频闪成像仪，从垂直于板的方向对弹性波进行拍摄，为单色平面波激励记录电影。我们在 200 至 400Hz（一个八度）的载波频率范围内观察到了良好的隐身行为，与完全连续介质力学数值处理吻合较好。因此，该系统非常适合用于演示实验，以展示变换光学的思想。
