期刊
PHYSICS LETTERS A
卷 377, 期 34-36, 页码 2199-2206出版社
ELSEVIER
DOI: 10.1016/j.physleta.2013.06.016
关键词
Acoustic superlens; Amphoteric refraction; Negative refraction; Active metamaterial; Multi-control strategy
资金
- National Natural Science Foundation of China [51275519, 10902123]
The present work describes the design of three flat superlens structures for acoustic source imaging and explores an active acoustic metamaterial (AAM) to realise such a design. The first two lenses are constructed via the coordinate transform method (CTM), and their constituent materials are anisotropic. The third lens consists of a material that has both a negative density and a negative bulk modulus. In these lenses, the quality of the images is clear and sharp; thus, the diffraction limit of classical lenses is overcome. Finally, a multi-control strategy is developed to achieve the desired parameters and to eliminate coupling effects in the AAM. (C) 2013 Elsevier B.V. All rights reserved.
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