Researchers at Nanjing University in China have come up with a novel way of making ultrasound imaging crisper using high-pitched sound waves. The idea is to let soundwaves coming in from one direction of the material pass through, but not those coming in from the other way. Or, as Scientific American puts it: “Think of a one-way mirror—but for sound.”
No known material can do this, but a metamaterial shaped into an “acoustic prism” could. Such a prism, perhaps made of brass, could make high-frequency one-way transmissions and “demonstrate an implementation by coiling up space.” The team published its research in Applied Physics Letters. (Read their full article here.)
From the abstract:
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Due to the acoustic tunneling effect, the waveform is kept consistent between input and output waves, and the transmitted angle can be controlled by reshaping the prism, even in the presence of hard scatterer. A directional waveguide is also designed whose transmission property can be freely switched between all possible states.
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