Physicists generated sound waves that travel in one direction only

Physicists at ETH Zurich and the Swiss Federal Institute of Technology Lausanne have developed a device that generates sound waves that travel in only one direction. This device consists of a disk-shaped cavity with three ports, allowing sound to be transmitted in a controlled manner. In its inactive state, sound from one port is heard equally by the other two ports, but when activated, only one port receives the sound. The key to this functionality is the introduction of swirling air at a specific speed and intensity, which synchronizes the sound waves and prevents energy loss during transmission. This method enhances the sound waves, making them stronger as they travel. The researchers believe this non-reciprocal wave propagation concept could have applications in future communication technologies, potentially extending to the manipulation of electromagnetic waves. Previous attempts at creating non-reciprocal sound systems faced challenges with energy dissipation, but this new approach successfully maintains and even amplifies sound energy. The findings were published in the journal Nature Communications and may aid in further studies of sound wave behavior and applications in radar and communication systems.

- Researchers created a device that allows sound waves to travel in one direction only.

- The device uses swirling air to synchronize sound waves and prevent energy loss.

- Sound waves can be amplified during transmission, contrary to previous designs.

- The technology may have implications for future communication systems and electromagnetic wave manipulation.

- The research was published in the journal Nature Communications.