Abstract
An ongoing research theme is identifying and exploiting similarities in exotic behaviors of light and sound waves. The titular device is the acoustic analogue of a metal-insulator-metal plasmonic waveguide. This study experimentally analyzes and validates the properties of the proposed waveguide, in terms of its dispersion and modal properties. Similar to a plasmonic waveguide, the proposed acoustic waveguide, and its supported symmetric and antisymmetric modes and group and phase velocities, can be largely controlled by changes in geometrical parameters, opening the possibility of applying this technology in acoustic tunable delay lines, modulators, and sensors.
Highlights
Surface plasmon polaritons (SPP) are electromagnetic waves supported at the interface of a dielectric material and noble metals due to the coupling of light with free electron oscillations [1]
We show how acoustic wave propagation can be controlled in the proposed waveguide by changing the gap height, which opens the possibility for applications in the domain of sensing and acoustic wave modulation
We present the acoustic SFS acoustic waveguide, which is an analogue of the MIM plasmonic waveguide
Summary
Surface plasmon polaritons (SPP) are electromagnetic waves supported at the interface of a dielectric material and noble metals due to the coupling of light with free electron oscillations [1]. Because of their specific nature, SPPs can break the diffraction limit and localize light into deeply subwavelength dimensions. One of the concepts that effectively mimics SPPs are spoof surface plasmon polaritons [6,7], which are supported by tailored structures, such as corrugated metallic surfaces whose geometrical properties can be used to. To validate our analytical and numerical results, the proposed structure is fabricated using three-dimensional- (3D) printing technology and measured in a controlled environment, showing excellent agreement with our theoretical and numerical predictions
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