Realistic prediction and engineering of high-Q modes to implement stable Fano resonances in acoustic devices

Felix Kronowetter (), Marcus Maeder, Yan Kei Chiang, Lujun Huang, Johannes D. Schmid, Sebastian Oberst, David A. Powell and Steffen Marburg
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Felix Kronowetter: Technical University of Munich
Marcus Maeder: Technical University of Munich
Yan Kei Chiang: University of New South Wales
Lujun Huang: University of New South Wales
Johannes D. Schmid: Technical University of Munich
Sebastian Oberst: University of Technology Sydney
David A. Powell: University of New South Wales
Steffen Marburg: Technical University of Munich

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Quasi-bound states in the continuum (QBICs) coupling into the propagating spectrum manifest themselves as high-quality factor (Q) modes susceptible to perturbations. This poses a challenge in predicting stable Fano resonances for realistic applications. Besides, where and when the maximum field enhancement occurs in real acoustic devices remains elusive. In this work, we theoretically predict and experimentally demonstrate the existence of a Friedrich-Wintgen BIC in an open acoustic cavity. We provide direct evidence for a QBIC by mapping the pressure field inside the cavity using a Laser Doppler Vibrometer (LDV), which provides the missing field enhancement data. Furthermore, we design a symmetry-reduced BIC and achieve field enhancement by a factor of about three compared to the original cavity. LDV measurements are a promising technique for obtaining high-Q modes’ missing field enhancement data. The presented results facilitate the future applications of BICs in acoustics as high-intensity sound sources, filters, and sensors.

Date: 2023
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DOI: 10.1038/s41467-023-42621-8

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