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An acoustic rectifier

Nature Materials volume 9, pages 989992 (2010) | Download Citation


The detection of acoustic signals is of relevance for a range of practical applications, for example in medical diagnostics. However, whereas rectification of electric current and other energy forms such as thermal flux has been demonstrated1,2,3,4,5,6, acoustic rectification has not yet been achieved. Here, on the basis of the earlier theoretical proposal of an ‘acoustic diode’7, we present the first experimental demonstration of a rectified energy flux of acoustic waves. A one-dimensional acoustic rectifier is fabricated by coupling a superlattice with a layer of ultrasound contrast agent microbubble suspension. A significant rectifying effect is observed within two frequency bands at locations that agree well with theoretical predictions. Following optimization of the concentration of the microbubble suspension, rectifying ratios can be as high as 104. This realization of an acoustic rectifier should have substantial practical significance, for example in the focusing of ultrasound in medical applications.

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  1. 1.

    , & Thermal diode: Rectification of heat flux. Phys. Rev. Lett. 93, 184301 (2004).

  2. 2.

    , & Interface thermal resistance between dissimilar anharmonic lattices. Phys. Rev. Lett. 95, 104302 (2005).

  3. 3.

    et al. Solid-state thermal rectifier. Science 314, 1121–1124 (2006).

  4. 4.

    , & An oxide thermal rectifier. Appl. Phys. Lett. 95, 171905 (2009).

  5. 5.

    & Phononics gets hot. Phys. World 21, 2729 (March 2008).

  6. 6.

    et al. Anomalous wave reflection at the interface of two strongly nonlinear granular media. Phys. Rev. Lett. 95, 158702 (2005).

  7. 7.

    , & Acoustic diode: Rectification of acoustic energy flux in one-dimensional systems. Phys. Rev. Lett. 103, 104301 (2009).

  8. 8.

    One-way mirror for sound waves. Phys. Rev. Focus 24, story 8 (2009).

  9. 9.

    et al. Locally resonant sonic materials. Science 289, 1734–1736 (2000).

  10. 10.

    et al. Acoustic nonlinearity of liquid containing encapsulated microbubbles. J. Acoust. Soc. Am. 116, 186–193 (2004).

  11. 11.

    Wave processes in media with strong acoustic nonlinearity. J. Acoust. Soc. Am. 90, 3332–3337 (1991).

  12. 12.

    Nonlinear acoustics of slightly compressible porous media. Sov. Phys. Acoust. 34, 523–526 (1988).

  13. 13.

    & Nonlinear Acoustics167–174 (Acoustical Society of America, 2008).

  14. 14.

    Acoustic Characterization of Contrast Agents for Medical Ultrasound Imaging43–88 (Kluwer Academic, 2001).

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This work was financially supported in part by National Basic Research Program 973 of China (Grant No. 2011CB707900), the National Science Foundation of China (Grant Nos. 10804050, 10874086, 10974093, 10704037, 10774072, 11074123 and 10974095), the Ministry of Education of China under Grant No 20060284035 and No 705017 and the Research Fund for the Doctoral Program (for new scholar) of Higher Education of China (20070284070).

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Author notes

    • B. Liang
    • , X. S. Guo
    •  & J. Tu

    These authors contributed equally to this work


  1. Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, China

    • B. Liang
    • , X. S. Guo
    • , J. Tu
    • , D. Zhang
    •  & J. C. Cheng
  2. State Key Laboratory of Acoustics, Chinese Academy of Sciences, Beijing 100190, China

    • B. Liang
    •  & J. C. Cheng


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B.L., X.S.G. and J.T. carried out the experiments and interpreted the data. J.C.C. and D.Z. conceived and supervised the study. All of the authors wrote the paper.

Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to D. Zhang or J. C. Cheng.

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