title: Observation of low-loss broadband supermode propagation in coupled acoustic waveguide complex.
abstract: We investigate analytically, numerically, and experimentally the low-loss supermode propagation in a coupled acoustic waveguide complex within a broadband. The waveguide complex is implemented with air channels coupled via an ultrathin metafluid layer. We analytically derive the field distribution of incident sound needed for producing acoustic supermodes, and verify the periodically revival propagation in coupled waveguide systems numerically and experimentally. We find out that the supermode wavelength becomes longer for higher mode order or lower frequency. We have also demonstrated the robust propagation of supermodes in broadband. Our scheme can in principle be extended to three dimensions and the ultrasound regime with simplicity and may promote applications of high-fidelity signal transfer in complicated acoustic networks.
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Ya-Xi
authors.initials: YX
authors.lastname: Shen
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.|Innovation Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Yu-Gui
authors.initials: YG
authors.lastname: Peng
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Xin-Cheng
authors.initials: XC
authors.lastname: Chen
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
authors.forename: De-Gang
authors.initials: DG
authors.lastname: Zhao
authors.affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.|Innovation Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.|State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, People's Republic of China.
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Zhu