Issue |
EPL
Volume 109, Number 2, January 2015
|
|
---|---|---|
Article Number | 28001 | |
Number of page(s) | 4 | |
Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
DOI | https://doi.org/10.1209/0295-5075/109/28001 | |
Published online | 23 January 2015 |
Experimental study on acoustic subwavelength imaging based on zero-mass metamaterials
Key Laboratory of Dynamics and Control of Flight Vehicle, Ministry of Education and School of Aerospace Engineering, Beijing Institute of Technology - Beijing 100081, China
Received: 25 September 2014
Accepted: 24 December 2014
Anisotropic zero-mass acoustic metamaterials are able to transmit evanescent waves without decaying to a far distance, and have been used for near-field acoustic subwavelength imaging. In this work, we design and fabricate such metamaterial lens based on clamped paper membrane units. The zero-mass frequency is determined by normal-incidence acoustic transmission measurement. At this frequency, we verify in experiment that the fabricated metamaterial lens is able to distinguish clearly two sound sources separated with a distance $0.16\lambda_{0}$ ($\lambda_{0}$ is the wavelength in air) below the diffraction limit. We also demonstrate that the imaging frequency is invariant to the change of the lens thickness.
PACS: 81.05.Xj – Metamaterials for chiral, bianisotropic and other complex media / 43.58.Ls – Acoustical lenses and microscopes / 43.60.Lq – Acoustic imaging, displays, pattern recognition, feature extraction
© EPLA, 2015
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