Enhancement of Quality Factor in Gain-Assisted Acoustic Resonance Systems  

作　　者：Lei Zhang Linlin Geng Yonghui Zhang Youdong Duan Jinbo Yuan Xiaoming Zhou 

机构地区：[1]Key Laboratory of Dynamics and Control of Flight Vehicle of Ministry of Education,School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,China

出　　处：《Acta Mechanica Solida Sinica》2025年第1期25-32,共8页固体力学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12225203,11622215,and 11872111);the 111 Project(Grant No.B16003).

摘　　要：Damped acoustic systems have a limited quality factor due to intrinsic loss.By introducing gain elements,a method to enhance the quality factor of damped systems is proposed based on the concept of bound states in the continuum(BICs).The acoustic model under study is a two-port waveguide system installed with two side Helmholtz resonators connected by a coupling tube.Based on the temporal coupled-mode theory,a Hamiltonian matrix with both intrinsic and radiation losses is used to characterize the resonance behavior of the coupled resonators.To achieve a high quality factor,acoustic gain is introduced to compensate the intrinsic loss,leading the Hamiltonian parameters toward a quasi-BIC condition.Numerical simulation demonstrates a gain-assisted and quasi-BIC-supported extremely high quality factor in damped acoustic systems.The concept is further utilized to design a sensor model for particle size detection.The enhanced sensing performance due to high quality factors is numerically demonstrated.The findings suggest potential applications in acoustic sensing and detection devices.

关 键 词：Acoustic resonance Quality factor Bound states in the continum Coupled-mode theory 

分 类 号：O422.3[理学—声学]