Abstract
A tunable and multi-functional one-dimensional metasurface, which is formed by engraving periodic semi-ellipse grooves on the surface of an aluminum half-space, is proposed in this paper. One characteristic of the metasurface is the manipulation of multi-physical fields, i.e. it could be utilized to manipulate surface elastic and acoustic waves simultaneously. The dispersion curves of the elastic and acoustic waves can be effectively tuned by adding liquids into the grooves. Based on the tunability different applications can be realized by adding different volumes of different liquids into the grooves. As an example, simultaneous rainbow trapping of the surface elastic and acoustic waves is demonstrated in the metasurface. Moreover, a resonant cavity where the elastic and acoustic waves are highly confined is reported. The proposed metasurface paves the way to the design of multi-functional devices for simultaneous control of elastic and acoustic waves.
Highlights
There has been growing interest in the manipulation of surface elastic waves (SEWs) or surface acoustic waves (SAWs) by a semi-infinite structure decorated with completely period structures or graded structures on the surfaces
We propose a tunable metasurface formed by an elastic half-space with period semiellipse grooves on the surface
The proposed metasurface is not limited to a single physical domain, and can perform multi-functions for surface elastic and surface acoustic waves simultaneously
Summary
Phononic crystals and metamaterials have attracted extensive attention because of their unique properties of manipulating elastic and acoustic waves and their potential applications in sound filters, acoustic waveguides, vibration isolators, and so on.[1,2] Recently, there has been growing interest in the manipulation of surface elastic waves (SEWs) or surface acoustic waves (SAWs) by a semi-infinite structure decorated with completely period structures or graded structures on the surfaces. Metasurfaces consisting of an array of grooves with graded width or height have been proposed.[16,17,18,19] Wave focusing[20,21,22,23,24] and wide-band wave absorption[25] phenomena have been observed in these graded structures Another peculiar phenomenon is “rainbow trapping”:17–19,26–29 broadband waves can be spatially separated to different frequency components and trapped in different places of the metamaterials, and the trapping position can be predicted. Phoxonic crystals and optomechanical crystals which have the abilities of controlling, guiding and confining photons and phonons simultaneously, have received extensive attention.[38,39] Theoretical and experimental works on simultaneous manipulation of electric and thermal fields have been reported.[40] In this paper, a liquid-assisted tunable metasurface for simultaneous manipulation of SEWs and SAWs is proposed.
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