Sound trapping in an open resonator

Lujun Huang, Yan Kei Chiang, Sibo Huang, Chen Shen, Fu Deng, Yi Cheng, Bin Jia, Yong Li (), David A. Powell () and Andrey E. Miroshnichenko ()
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Lujun Huang: University of New South Wales
Yan Kei Chiang: University of New South Wales
Sibo Huang: Tongji University
Chen Shen: Rowan University
Fu Deng: University of New South Wales
Yi Cheng: Tongji University
Bin Jia: Tongji University
Yong Li: Tongji University
David A. Powell: University of New South Wales
Andrey E. Miroshnichenko: University of New South Wales

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The ability of sound energy confinement with high-quality factor resonance is of vital importance for acoustic devices requiring high intensity and hypersensitivity in biological ultrasonics, enhanced collimated sound emission (i.e. sound laser) and high-resolution sensing. However, structures reported so far have been experimentally demonstrated with a limited quality factor of acoustic resonances, up to several tens in an open resonator. The emergence of bound states in the continuum makes it possible to realize high quality factor acoustic modes. Here, we report the theoretical design and experimental demonstration of acoustic bound states in the continuum supported by a single open resonator. We predicted that such an open acoustic resonator could simultaneously support three types of bound states in the continuum, including symmetry protected bound states in the continuum, Friedrich-Wintgen bound states in the continuum induced by mode interference, as well as a new type-mirror symmetry induced bound states in the continuum. We also experimentally demonstrated their existence with quality factor up to one order of magnitude greater than the highest quality factor reported in an open resonator.

Date: 2021
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DOI: 10.1038/s41467-021-25130-4

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