Broadband acoustic invisibility and illusions

Theodor S. Becker, Dirk-Jan van Manen, Thomas Haag, Christoph Barlocher, Jack Li, Nele Borsing, Andrew Curtis, Marc Serra-Garcia, Johan O. A. Robertsson

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Rendering objects invisible to impinging acoustic waves (cloaking) and creating acoustic illusions (holography) has been attempted using active and passive approaches. While most passive methods are inflexible and applicable only to narrow frequency bands, active approaches attempt to respond dynamically, interfering with broadband incident or scattered wavefields by emitting secondary waves. Without prior knowledge of the primary wavefield, the signals for the secondary sources need to be estimated and adapted in real time. This has thus far impeded active cloaking and holography for broadband wavefields. We present experimental results of active acoustic cloaking and holography without prior knowledge of the wavefield so that objects remain invisible and illusions intact even for broadband moving sources. This opens previously inaccessible research directions and facilitates practical applications including architectural acoustics, education, and stealth.
Original languageEnglish
JournalScience Advances
Issue number37
Publication statusPublished - 10 Sept 2021


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