article · Advanced Science
Confining waves within open systems is a major area of exploration in wave physics. Particular attention has focused on bound states in the continuum, which are wave modes that remain trapped without decaying into the surrounding open environment. This research provides a theoretical investigation and experimental confirmation of quasi-bound states in the continuum for ultrasonic waves using an elastic Fabry-Perot metasurface resonator. The generated states display properties that remain robust during parameter variations. Testing in an underwater acoustic setup demonstrated an exceptionally high quality factor of 350 at an operating frequency of around 1 MHz, which substantially exceeds current state-of-the-art acoustic systems. The results introduce a fresh framework for developing efficient, ultra-high quality factor devices for ultrasonic applications.
Resonators that trap sound waves without energy leakage are critical for high-precision acoustic technologies. By demonstrating trapped wave modes that resist decay in open environments, this work shows how to significantly boost resonance performance in ultrasound systems. Achieving higher quality factors enables clearer signal transmission and more sensitive acoustic devices.
The work presents a design method for building efficient, ultra-high quality factor ultrasound devices, relevant to engineers developing acoustic sensing or underwater hardware. Given that the technology was demonstrated as an experimental proof of concept in a laboratory underwater setup, the findings sit at an early stage of research and require further development before direct integration into commercial products.
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The confinement of waves in open systems represents a fundamental phenomenon extensively explored across various branches of wave physics. Recently, significant attention is directed toward bound states in the continuum (BIC), a class of modes that are trapped but do not decay in an otherwise unbounded continuum. Here, the theoretical investigation and experimental demonstration of the existence of quasi-bound states in the continuum (QBIC) for ultrasonic waves are achieved by leveraging an elastic Fabry-Pérot metasurface resonator. Several intriguing properties of the ultrasound quasi-bound states in the continuum that are robust to parameter scanning are unveiled, and experimental evidence of a remarkable Q-factor of 350 at ≈1 MHz frequency, far exceeding the state-of-the-art using a fully acoustic underwater system is presented. The findings contribute novel insights into the understanding of BIC for acoustic waves, offering a new paradigm for the design of efficient, ultra-high Q-factor ultrasound devices.
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DOI: 10.1002/advs.202402917
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