Berraquero C P, Maurel A, Petitjeans P, Pagneux V
Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
Institut Langevin LOA, UMR CNRS 7587-ESPCI, 5 rue Jussieu, 75005 Paris, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Nov;88(5):051002. doi: 10.1103/PhysRevE.88.051002. Epub 2013 Nov 19.
We demonstrate by quantitative experimental measurements that metamaterials with anisotropic properties can be used in the context of water waves to produce a reflectionless bent waveguide. The anisotropic medium consists in a bathymetry with subwavelength layered structure that shifts the wave in the direction of the waveguide bending (10°, 20°, and 30°). The waveguide filled with such metamaterial is tested experimentally and compared to a reference empty bent waveguide. The experimental method used to characterize the wave field allows for space-time resolved measurements of water elevation. Results show the efficiency of the shifter. Modal treatment of the experimental data confirms that the metamaterial prevents higher modes from being excited in the waveguide.
我们通过定量实验测量证明，具有各向异性特性的超材料可用于水波环境中，以产生无反射弯曲波导。各向异性介质由具有亚波长分层结构的水深构成，该结构使波沿波导弯曲方向（10°、20°和30°）移动。填充有这种超材料的波导经过实验测试，并与参考空弯曲波导进行比较。用于表征波场的实验方法允许对水位进行时空分辨测量。结果显示了移位器的效率。对实验数据的模态处理证实，超材料可防止在波导中激发高阶模。
