Acoustic seminar | 25 September 2026

This seminar presents a theoretical and experimental study of acoustic bound states in the continuum (BICs) realized using a labyrinthine meta-atom embedded in an acoustic waveguide. When the meta-atom is positioned on the waveguide axis, the system supports a symmetry-protected BIC, while shifting it away from the axis breaks the symmetry and transforms the state into a radiative quasi-BIC, observed as a narrow resonance in the transmittance spectrum. The proposed platform offers control over radiative and absorptive decay channels and may be useful for tunable acoustic absorbers, sensors, and modulators.

Main paper/arXiv, related to the seminar, and other references

- C. W. Hsu, B. Zhen, A. D. Stone, J. D. Joannopoulos, and M. Soljačić, Bound states in the continuum, Nature Reviews Materials 1, 16048 (2016).
- Z. Sadrieva, K. Frizyuk, M. Petrov, Y. Kivshar, and A. Bogdanov, Multipolar origin of bound states in the continuum, arXiv preprint arXiv:1903.00309 (2019).
- A. F. Sadreev, Interference traps waves in an open system: bound states in the continuum, Reports on Progress in Physics 84, 055901 (2021).