Acoustic Purcell effect induced by quasibound state in the continuum

Huang, Sibo; Xie, Shu-Huan; Gao, He; Tu, Hao; Zhang, Shuang; Liu, Tuo; Li, Yong; Zhu, Jie

doi:10.1016/j.fmre.2022.06.009

Cited by 17 publications

(4 citation statements)

References 60 publications

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“…In the context of acoustics, they were first studied by Parker [2,3] and have since then been explored in-depth with various approaches and mathematical tools (see e.g., [4][5][6][7][8][9][10][11][12][13]). Recent experimental verifications [14][15][16] have confirmed their theoretical potential. In this article, quasi BICs are used to construct a silencer that suppresses a strong spectral line while maintaining favorable conditions for fluid transport and overall geometrical features.…”

Section: Introductionmentioning

confidence: 81%

Design of low drag reactive silencers based on the bound states in the continuum

Hruka,

Krpenský,

Bednařík

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The phenomenon of bound states in the continuum and leaky resonances is employed to design a reactive silencer. It is targeted to prevent a significant spectral line from propagating in a flow-duct while maintaining low pressure drop and installation space (without any lateral extensions). The quasi bound states are achieved by tuning the geometrical parameters of thin plates embedded in a waveguide with dimensions and flow velocities typical for ventilation systems. In general, the procedure works for waveguides with plane wave propagation in the low Mach number regime. An optimization by evolution strategies used for this purpose is described and illustrated on two specific examples.

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Section: Introductionmentioning

confidence: 81%

Design of low drag reactive silencers based on the bound states in the continuum

Hruka,

Krpenský,

Bednařík

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…This theoretical model comprehensively describes the interactions among resonances by means of the fundamental qualities of radiation and thermal-viscous dissipation of each resonance, which therefore reveals the underlying physical picture of global coupling and facilities the modulation of global coupling for timbre modulation. Suppose a resonant system supports N coherently coupled modes, the amplitude of the nth mode/resonance can be expressed as [57][58][59] d dt ãn = ( jωn − γn − Γn) ãn + j…”

Section: Theoretical Modelmentioning

confidence: 99%

Meta-silencer with designable timbre

Wang

Zhou

Qiu

et al. 2023

Int. J. Extrem. Manuf.

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Timbre, as one of the essential elements of sound, plays an important role in determining sound properties, whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of resonances. Here, we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in broadband. Strong global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model, which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre tuning. As proof-of-concept demonstrations for our design concepts, we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation, efficiency-controlled sound attenuation and designable timbre, respectively. The proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 mm. Our work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering, impedance engineering, and architectural acoustics.

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“…Furthermore, the theoretical and experimental demonstration of BIC induced high Q-factors [28,29] can be applied to the design of novel, high-performance acoustics sensors. Huang et al [30] demonstrate a Friedrich-Wintgen quasi-BIC leading to emission enhancement of a sound source by nearly two orders of magnitude. Recent studies have suggested that acoustodynamic devices can be used for quantum computing [31][32][33], where the BIC-induced high-Q Fano resonance could be of further interest.…”

mentioning

confidence: 99%

Direct visualization of a Friedrich-Wintgen quasi-bound state in the continuum

Kronowetter

Maeder

Chiang

et al. 2023

Preprint

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Bound states in the continuum (BICs) are a well known phenomenon in physics, particularly in quantum physics and wave physics. Since BICs are local states, their existence typically manifests as Fano resonances in the transmission or reflection spectrum. However, to date no direct or visual proof of an acoustic BIC has been reported. We demonstrate the existence of a Friedrich-Wintgen BIC in an open acoustic cavity by theory and experiments. The appearance of the BIC is characterized by the vanished line width of the Fano resonance in the measured transmission spectrum. Our theoretical predictions accurately match the experimental observations. We map the pressure field of the transparent open cavity hosting a Friedrich-Wintgen BIC using laser Doppler vibrometry, which is the first reported visualization of an acoustic BIC. Mapping the pressure field of the BIC is a new technique to extract real sound pressure values of high-Q modes. We can draw conclusions from the pressure values on the confinement of the BIC. Our results facilitate the future development of applications of BICs in the field of acoustics, as acoustic sources, filters, and sensors.

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Acoustic Purcell effect induced by quasibound state in the continuum

Cited by 17 publications

References 60 publications

Design of low drag reactive silencers based on the bound states in the continuum

Design of low drag reactive silencers based on the bound states in the continuum

Meta-silencer with designable timbre

Direct visualization of a Friedrich-Wintgen quasi-bound state in the continuum

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