Asymmetric trapped modes in a tube waveguide with a bulge

Li, W. S.; Zou, Jiong; Lee, K. Y.; Li, X. F.

doi:10.1007/s00707-017-1999-9

Cited by 4 publications

(1 citation statement)

References 19 publications

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“…The history of BIC in acoustics can be traced back to 1951, where Ursell theoretically demonstrated the existence of trapped modes in a sphere that is connected to a cylindrical waveguide on both sides 24 , 25 . Later, different types of acoustic BICs, including symmetry-protected BICs, Friedrich–Wintgen BICs, and Fabry–Perot BICs, have been subsequently found theoretically in different kinds of acoustic systems 26 – 34 . On the experimental side, the existence of symmetry-protected BIC has been confirmed in various systems (such as a plate inside the waveguide or asymmetric pair resonators placing at the end of the waveguide) 35 – 39 .…”

Section: Introductionmentioning

confidence: 99%

Sound trapping in an open resonator

et al. 2021

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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.

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