Abstract
Acoustic metamaterials can manipulate sound waves in surprising ways, which include collimation, focusing, cloaking, sonic screening and extraordinary transmission1,2,3,4,5,6,7,8,9,10,11,12,13,14. Recent theories suggested that imaging below the diffraction limit using passive elements can be realized by acoustic superlenses or magnifying hyperlenses15,16. These could markedly enhance the capabilities in underwater sonar sensing, medical ultrasound imaging and non-destructive materials testing. However, these proposed approaches suffer narrow working frequency bands and significant resonance-induced loss, which hinders them from successful experimental realization. Here, we report the experimental demonstration of an acoustic hyperlens that magnifies subwavelength objects by gradually converting evanescent components into propagating waves. The fabricated acoustic hyperlens relies on straightforward cutoff-free propagation and achieves deep-subwavelength resolution with low loss over a broad frequency bandwidth.
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Acknowledgements
We acknowledge support from the Office of Naval Research (grant number N00014-07-1-0626). L.F. acknowledges a fellowship from the National Science Foundation Graduate Fellowship Program.
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J.L. developed the device concept and design. L.F. and J.L. fabricated the device. L.F. and X.Y. constructed the experimental set-up. J.L. and L.F. conducted the theoretical simulations and experiments. X.Z., G.B. and J.L. guided the theoretical and experimental investigations. J.L., L.F., G.B. and X.Z. analysed data and wrote the manuscript.
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Li, J., Fok, L., Yin, X. et al. Experimental demonstration of an acoustic magnifying hyperlens. Nature Mater 8, 931–934 (2009). https://doi.org/10.1038/nmat2561
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DOI: https://doi.org/10.1038/nmat2561
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