Abstract
This paper describes the fabrication of a water channel heterostructure by combining two types of periodic sidewalls with different duty ratios. This enables the manipulation and localization of water surface waves in bands that are traditionally inaccessible. It is well known that such forbidden bands can be created by the introduction of periodicity, in which the wave propagation is efficiently attenuated when the Bragg condition is satisfied. Through experiments and simulations, we show that an extraordinary transmission arises in the bandgap after two types of periodic channels are combined, even though they have similar forbidden bands. Waves that cannot travel along each channel then begin to propagate along the heterostructure channel. The measured surface amplitude of the water waves indicates that the localization around the interface of two periodic structures is responsible for the extraordinary transmission. The localized energy of water waves shifts according to the distance between the two periodic structures, and the localization and transmission disappear at certain distances. The measurement and analysis of this intriguing phenomenon of water wave manipulation will benefit applications in the collection and utilization of water wave energy.
Highlights
The complicated and significant characteristics of the marine environment have attracted researchers for many years.1–6 Among these marine phenomena, the most commonly studied ones are water waves
We have achieved the manipulation of water surface wave localization in a channel with heterostructure sidewalls, which is composed of two corrugated water channels with different duty ratios
Each channel has its own bandgap in a similar frequency range, at which the water surface waves cannot propagate through the channel
Summary
The complicated and significant characteristics of the marine environment have attracted researchers for many years. Among these marine phenomena, the most commonly studied ones are water waves. On the basis of these interaction characteristics, we have designed a water channel structure that enables further investigation of the flow of water, considering several functions in the marine environment. These have been generalized to combinations of other structures or materials with different energies or bandgaps. Due to the different topological characteristics of the bandgaps, the generation of an extraordinary transmission through the water channel heterostructure is very promising. As the distance between the two structures increases, the position of energy localization remains almost unchanged around the last segment of the first channel The localization of this water wave heterostructure could be used in various fields, such as barriers and energy collectors. A deeper understanding of the localization characteristics will be highly useful for such applications
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