零折射率的宽带聚焦和准直水波。
Broadband focusing and collimation of water waves by zero refractive index.
机构信息
Department of Materials Science, Laboratory of Advanced Materials and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
出版信息
Sci Rep. 2014 Nov 10;4:6979. doi: 10.1038/srep06979.
It is always a challenge to realize extreme and unusual values of refractive index for a broad range of frequencies. We show that when water is covered by a thick, rigid and unmovable plate, it behaves like a medium with zero refractive index for water waves at any frequency. Hence, by covering water with a plate of a concave or rectangular shape, water waves can be focused or collimated in a broad range of frequencies. Experiments were conducted to demonstrate these effects and results are in excellent agreement with numerical simulations.
实现宽频带范围内的折射率的极值和非常值一直是一个挑战。我们表明，当水被一块厚的、刚性的和不可移动的板覆盖时，对于任何频率的水波，它都表现为具有零折射率的介质。因此，通过用凹面或矩形的板覆盖水，可以在宽频带范围内聚焦或准直水波。进行了实验来证明这些效果，结果与数值模拟非常吻合。
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