期刊
JOURNAL OF APPLIED PHYSICS
卷 116, 期 19, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4901996
关键词
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资金
- National Natural Science Foundation of China [11172038, 11221202]
- Program for New Century Excellent Talents in University [NCET-11-0794]
We present analytical and numerical analyses of a yet unseen lensing paradigm that is based on a solid metamaterial slab in which the wave excitation source is attached. We propose and demonstrate sub-diffraction-limited acoustic focusing induced by surface resonant states in doubly negative metamaterials. The enhancement of evanescent waves across the metamaterial slab produced by their resonant coupling to surface waves is evidenced and quantitatively determined. The effect of metamaterial parameters on surface states, transmission, and wavenumber bandwidth is clearly identified. Based on this concept consisting of a wave source attached on the metamaterial, a high resolution of lambda/28.4 is obtained with the optimum effective physical parameters, opening then an exciting way to design acoustic metamaterials for ultrasonic focused imaging. (C) 2014 AIP Publishing LLC.
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