期刊
JOURNAL OF APPLIED PHYSICS
卷 112, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4747931
关键词
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资金
- FWF Austrian Science Fund under the Lise Meitner Position [M 1298-N20]
- Christian Doppler Research Association
- Federal Ministry of Economy, Family and Youth
- European Regional Development Fund in the framework of the European Union program Regio 13
- federal state of Upper Austria
Focusing and subwavelength imaging of surface acoustic waves (SAWs) through a phononic crystal flat lens are discussed in the presented work. Experimental and numerical wave fields are obtained in the time-domain by an optical technique and by numerical simulations. Spatial distributions of the acoustic field are accessed using a temporal Fourier transform. The revealed focusing of the elastic waves in the first band of the crystal is governed by the concave equifrequency contour of the leaky-Rayleigh wave. The spatial distributions of the experimental and numerical acoustic fields also unfold subwavelength imaging of SAWs. Numerical simulations show that the imaging quality can be improved by embedding the flat lens into a medium with higher wave velocity. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4747931]
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