Effect of excitation point on surface phonon fields in phononic crystals in real- and k-space

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We investigate surface phonon propagation in a triangular-lattice phononic crystal of microscopic holes in a gold-coated polymer by time-resolved two-dimensional imaging and by finite-element simulations at sub-gigahertz frequencies. The simulations allow the effects of exciting different points in the crystal lattice to be studied in real space, and also in k-space by spatiotemporal Fourier analysis. The acoustic field in a sub-surface plane below the reach of the holes is also revealed in real-and k-spaces. In addition, we demonstrate pitfalls in the analysis of k-space data when searching for the presence of band gaps. Applications include surface-acoustic wave filter quality control.
Publisher
AMER INST PHYSICS
Issue Date
2015-06
Language
English
Article Type
Article
Keywords

2-DIMENSIONAL SONIC CRYSTALS; BAND-STRUCTURE; COMPOSITES; EXISTENCE; PRESSURE; LATTICES; WAVES; MODES; GAPS

Citation

JOURNAL OF APPLIED PHYSICS, v.117, no.24

ISSN
0021-8979
DOI
10.1063/1.4922350
URI
http://hdl.handle.net/10203/200730
Appears in Collection
EE-Journal Papers(저널논문)
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