用于地震波的平面透镜
Flat lens for seismic waves
摘要：
实现地震不可见性的先决条件是证明土木工程师能够用人工结构化土壤控制地震波。我们进行了大规模的现场试验与结构化土壤组成的网格组成的圆柱形和垂直孔在地面和低频人工源（< 10 Hz）。这允许识别网格内部的能量分布，其可以被解释为有效负折射率的结果。这种平面透镜让人联想到Veselago和Pendry对光的设想，为地震超材料开辟了道路，以抵消地震信号中最具破坏性的成分。
英文摘要：
A prerequisite for achieving seismic invisibility is to demonstrate the ability of civil engineers to control seismic waves with artificially structured soils. We carry out large-scale field tests with a structured soil made of a grid consisting of cylindrical and vertical holes in the ground and a low frequency artificial source (< 10 Hz). This allows the identification of a distribution of energy inside the grid, which can be interpreted as the consequence of an effective negative refraction index. Such a flat lens reminiscent of what Veselago and Pendry envisioned for light opens avenues in seismic metamaterials to counteract the most devastating components of seismic signals.
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