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Nature Research, Scientific Reports, 1(4), 2014

DOI: 10.1038/srep06979

2016 Progress in Electromagnetic Research Symposium (PIERS)

DOI: 10.1109/piers.2016.7735207

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Broadband focusing and collimation of water waves by zero refractive index

Journal article published in 2014 by Chi Zhang, Che Ting Chan ORCID, Xinhua Hu
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractIt 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.