Abstract
Space-coiling acoustic metasurfaces have been largely exploited and shown their outstanding wave manipulation capacity. However, they are complex in realization and cannot directly manipulate acoustic near-fields by controlling the effective path length. Here, we propose a comprehensive paradigm for acoustic metasurfaces to extend the wave manipulations to both far- and near-fields and markedly reduce the implementation complexity with a simple structure, which consists of an array of deep-subwavelength-spaced slits perforated in a thin plate. A semi-analytical approach for such a design is established using a microscopic coupled-wave model, which reveals that the acoustic diffractive pattern at every slit exit is the sum of the initial transmission and the secondary scatterings of the coupled fields from other slits. For proof-of-concept, we examine two metasurface lenses for sound focusing within and beyond the diffraction limit. This work provides a feasible strategy for creating ultra-compact acoustic components with versatile potentials.
Highlights
Space-coiling acoustic metasurfaces have been largely exploited and shown their outstanding wave manipulation capacity
Acoustic responses can be controlled by engineering the wave interactions with the unit elements, which can take various forms, such as masses deposited on films and apertures opened in thin plates
Creating acoustic metasurfaces without cumbersome structures would be of both fundamental and practical significance, but the complexity of the current structures remains a critical barrier. We propose another avenue in the design of the acoustic metasurface lens, to extend the wave manipulations to both far- and near-fields and markedly reduce the design a
Summary
Space-coiling acoustic metasurfaces have been largely exploited and shown their outstanding wave manipulation capacity. Acoustic responses can be controlled by engineering the wave interactions with the unit elements, which can take various forms, such as masses deposited on films and apertures opened in thin plates Based on this concept, acoustic metasurfaces have exhibited diverse functionalities, including focusing[8,9,10], extraordinary transmission and reflection[11,12], negative refraction[13], one-way propagation[14,15,16,17], perfect absorption[18,19], and cloaking[20,21]. The capability to pack simple structures at spacing well below the wavelength suggests a feasible approach for creating ultra-compact acoustic components with ease-of-manufacture and versatile potentials
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