Researchers have created a device that—with high efficiency and no energy input—transports a sound wave of a specific frequency and shape while not allowing the wave to be transmitted in the reverse direction. This unidirectional device circumvents the side effects that have plagued other devices, such as the distortion of transmitted signals. The device is a modified waveguide that includes three regions with different resonant properties. The structure could lead to improvements in ultrasound imaging and other acoustic technologies.
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