title: Tunable sound transmission at an impedance-mismatched fluidic interface assisted by a composite waveguide.
abstract: We report a composite waveguide fabricated by attaching a coupling aperture to a waveguide. The acoustic impedance of the composite waveguide can be regulated by merely controlling its coupling vibrations, depending on its structure size. By changing the size to adjust the acoustic impedance of the composite waveguide at an impedance-mismatched fluidic interface, tunable sound transmission at the desired frequencies is achieved. The reported composite waveguide provides a new method for sound regulation at a mismatched fluidic interface and has extensive frequency hopping and frequency agility applications in air-water sound communication.
authors.affiliation: Key Laboratory of Modern Acoustics, MOE, School of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Modern Acoustics, MOE, School of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Wei
authors.affiliation: Key Laboratory of Modern Acoustics, MOE, School of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Li
authors.initials: L
authors.lastname: Fan
authors.affiliation: Department of Mechanical Engineering, Tufts University, Medford, Massachusetts 02155, USA.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Qu
authors.affiliation: Key Laboratory of Modern Acoustics, MOE, School of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Shu-Yi
authors.initials: SY
authors.lastname: Zhang