Acoustic surface waves on three-dimensional groove gratings with sub-wavelength thickness

Spoof surface acoustic waves (SSAWs) can be tightly confined at the subwavelength scale by groove gratings and propagate along the surface with low loss in a broad bandwidth. Here, we put forward a three-dimensional SSAW waveguide with a compact cross section perpendicular to the propagation directi...

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Bibliographic Details
Published in:Applied physics express 2018-08, Vol.11 (8), p.87301
Main Authors: Cao, Wen Kang, Wu, Li Ting, Zhang, Cheng, Song, Gang Yong, Ke, Jun Chen, Cheng, Qiang, Cui, Tie Jun
Format: Article
Language:English
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Summary:Spoof surface acoustic waves (SSAWs) can be tightly confined at the subwavelength scale by groove gratings and propagate along the surface with low loss in a broad bandwidth. Here, we put forward a three-dimensional SSAW waveguide with a compact cross section perpendicular to the propagation direction. By introducing an additional transition part for mode conversion, the proposed SSAW waveguide can guide surface modes in a wide frequency range under the excitation of a point source. Both numerical and experimental results confirm the validity of the proposed design, thus offering attractive prospects for acoustic surface wave applications.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.11.087301