Acoustic subwavelength imaging of subsurface objects with acoustic resonant metalens
Acoustic subwavelength imaging of subsurface objects with acoustic resonant metalens
复制标题
利用声谐振元透镜对地下物体进行声亚波长成像
DOI：
10.1063/1.4837875
复制
发表时间：
2013-11-25
影响因子：
4
通讯作者：
Liu, XiaoJun
中科院分区：
文献类型：
--
作者：
Cheng, Ying;Zhou, Chen;Liu, XiaoJun
Early research into acoustic metamaterials has shown the possibility of achieving subwavelength near-field acoustic imaging. However, a major restriction of acoustic metamaterials is that the imaging objects must be placed in close vicinity of the devices. Here, we present an approach for acoustic imaging of subsurface objects far below the diffraction limit. An acoustic metalens made of holey-structured metamaterials is used to magnify evanescent waves, which can rebuild an image at the central plane. Without changing the physical structure of the metalens, our proposed approach can image objects located at certain distances from the input surface, which provides subsurface signatures of the objects with subwavelength spatial resolution.
