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Physicists have discovered an amazing new type of sound wave

By creating a special metamaterial filter, scientists have discovered a surprisingly new type of sound wave that with transverse vibrations can be widely used in communication and measurement. have sound.

Can you imagine sound moving like light? A research team at the University of Hong Kong (CityU) recently discovered a new type of sound wave that vibrates transversely in the air and carries rotational and orbital angles like light. The new findings break scientists' previous beliefs about sound waves and pave the way for the development of new applications in voice communications, sound measurement and imaging.

Translated by Nature Communications, started by Dr. Wang Shubo, Assistant Professor at the CityU School of Physics, in collaboration with scientists from Hong Kong Baptist University (HKBU) and the University of Science and Technology. Hong Kong technology (HKUST) continued.

Beyond the usual understanding of sound waves

Physics textbooks tell us that there are two types of waves. In transverse waves such as light, vibrations are perpendicular to the direction of wave propagation and in longitudinal waves such as sound, vibrations are parallel to the direction of wave propagation. But the latest finding from City of Hong Kong scientists is changing this age-old perception of sound waves.

BingMag.com <b>Physicists</b> <b>have</b> <b>discovered</b> an <b>amazing</b> <b>new</b> <b>type</b> of <b>sound</b> wave Graphic design of meta-atoms and transverse sound waves
Credit: Wang, S., Zhang, G., Wang, X. et al.
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Concept and realization of micro-polar metamaterial

Researchers innovatively designed a type of synthetic material called "Micropolar Metamaterial" to implement the idea, which resembles a complex network of Intensifiers appear. The air is trapped inside these interconnectors and forms a meta-atom.

BingMag.com <b>Physicists</b> <b>have</b> <b>discovered</b> an <b>amazing</b> <b>new</b> <b>type</b> of <b>sound</b> wave

Negative failure induced by spatial interaction
Credit: Wang, S., Zhang, G., Wang, X. et al.

It is hard enough and the air inside it can only vibrate and support audio playback. Theoretical calculations showed that in fact the mass motion of these air meta-atoms creates the necessary shear force and creates transverse sound with spin-orbit interaction within this metamaterial. This theory was later confirmed by experiments performed by Dr. Ma Guancong It behaves elastically and therefore supports transverse sound with spin and orbital angular momentum. Thus, using this metamaterial, they demonstrated for the first time two types of spin-orbit interactions in sound. ; This means that when passing through an interface, the sound bends in the opposite direction. Another is real-time spin-orbit interaction, which produces sound vortices under the excitation of transverse sound. have a rotational angle such as momentum. This important discovery offers new insights and functions for manipulating sound beyond the ordinary degree of scalar freedom.

BingMag.com <b>Physicists</b> <b>have</b> <b>discovered</b> an <b>amazing</b> <b>new</b> <b>type</b> of <b>sound</b> wave

Researchers studying transverse sound; "This is a groundbreaking discovery, and we anticipate further exploration of the attractive properties of transverse sound," said Dr. Wang on the right. Credit: City University of Hong Kong

"By manipulating these additional vector features, scientists may be able to encrypt more data in transverse sound to transcend traditional communications by sound waves." It is made possible by its angular momentum, and according to Wang, the discovery is likely to pave the way for the development of new applications in voice communications, audio measurement and imaging.

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Cover Photo: Graphic Design of Transverse sound Waves
Credit: Credit: Wang, S., Zhang, G., Wang, X. et al.


Source: SciTechDaily

Tags: physicists, have, discovered, amazing, new, type, sound, wave

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