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An invisible acoustic sensor based on parity-time symmetry

Author

Listed:
  • Romain Fleury

    (The University of Texas at Austin)

  • Dimitrios Sounas

    (The University of Texas at Austin)

  • Andrea Alù

    (The University of Texas at Austin)

Abstract

Sensing an incoming signal is typically associated with absorbing a portion of its energy, inherently perturbing the measurement and creating reflections and shadows. Here, in contrast, we demonstrate a non-invasive, shadow-free, invisible sensor for airborne sound waves at audible frequencies, which fully absorbs the impinging signal, without at the same time perturbing its own measurement or creating a shadow. This unique sensing device is based on the unusual scattering properties of a parity-time (PT) symmetric metamaterial device formed by a pair of electro-acoustic resonators loaded with suitably tailored non-Foster electrical circuits, constituting the acoustic equivalent of a coherent perfect absorber coupled to a coherent laser. Beyond the specific application to non-invasive sensing, our work broadly demonstrates the unique relevance of PT-symmetric metamaterials for acoustics, loss compensation and extraordinary wave manipulation.

Suggested Citation

  • Romain Fleury & Dimitrios Sounas & Andrea Alù, 2015. "An invisible acoustic sensor based on parity-time symmetry," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms6905
    DOI: 10.1038/ncomms6905
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    Cited by:

    1. Hanif, Y. & Sarfraz, H. & Saleem, U., 2019. "General, symmetry non-preserving and preserving multiple soliton solutions of long wave-short wave resonant models," Chaos, Solitons & Fractals, Elsevier, vol. 125(C), pages 119-138.
    2. Stanislav Sergeev & Romain Fleury & Hervé Lissek, 2023. "Ultrabroadband sound control with deep-subwavelength plasmacoustic metalayers," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. Weijie Liu & Quancheng Liu & Xiang Ni & Yuechen Jia & Klaus Ziegler & Andrea Alù & Feng Chen, 2024. "Floquet parity-time symmetry in integrated photonics," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    4. Yumeng Yang & Xinrong Xie & Yuanzhen Li & Zijian Zhang & Yiwei Peng & Chi Wang & Erping Li & Ying Li & Hongsheng Chen & Fei Gao, 2022. "Radiative anti-parity-time plasmonics," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    5. Humire, Fernando R. & Zárate, Yair D. & Joglekar, Yogesh N. & García-Ñustes, Mónica A., 2023. "Classical Rabi oscillations induced by unbalanced dissipation on a nonlinear dimer," Chaos, Solitons & Fractals, Elsevier, vol. 171(C).
    6. Sarfraz, H. & Saleem, U., 2020. "Symmetry broken and symmetry preserving multi-soliton solutions for nonlocal complex short pulse equation," Chaos, Solitons & Fractals, Elsevier, vol. 130(C).

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