We design and experimentally demonstrate an acoustic tunnel completely open for substances like fluids or other energy fluxes to exchange while allowing sound to pass only in one direction. This significant feature is based on a distinctive mechanism using metasurface pairs to yield asymmetric extraordinary reflections along opposite directions. Theoretical analysis is presented to analytically predict the trajectory of the wave. The experimental results agree well with the numerical results and the theoretical predictions. Our design may pave the way to more versatile acoustic one-way devices with potential applications in many scenarios like duct noise control and ultrasonic therapy.
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