Sound Trapping in an Open Resonator

Abstract

The ability of extreme sound energy confinement with high-quality factor (Q-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 demonstrated a limited quality factor (Q-factor) of acoustic resonances, up to several tens in an open resonator. The emergence of bound states in the continuum (BIC) makes it possible to realize high-Q factor acoustic modes. Here, we report the theoretical design and experimental demonstration of acoustic BICs supported by a single open resonator. We predicted that such an open acoustic resonator could simultaneously support three types of BICs, including symmetry protected BIC, Friedrich-Wintgen BIC induced by mode interference, as well as a new kind of BIC: mirror-symmetry induced BIC. We also experimentally demonstrated the existence of all three types of BIC with Q-factor up to one order of magnitude greater than the highest Q-factor reported in an open resonator.

arXiv comment14 pages, 5 figures

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Cited by in corpus (6)

• Bound States in the Continuum in Compact Acoustic Resonators
• A Universal Mirror-stacking Approach for Constructing Topological Bound States in the Continuum
• Degenerate bound states in the continuum in square and triangular open acoustic resonators
• Acoustic Bound States in the Continuum in Coupled Helmholtz Resonators
• Bound states in the continuum in a two-channel Fano-Anderson model
• Deployable Nanoelectromechanical Bound States in the Continuum Enabled by GHz Lamb Wave Phononic Crystals on LiNbO3 Thin Films