Through a $2 million grant from the National Science Foundation, physics researchers Arup Neogi, a University Distinguished Research Professor, along with professor Arkadii Krokhim, disproved the Rayleigh Reciprocity Theorem.
“Imagine a room where a conversation is taking place between two people,” Neogi says. “I speak to you and you hear me. You speak to me and I hear you. This works even if we switch places. That is Rayleigh’s theory of sound and reciprocity.”
The two disproved the theory by taking into account viscosity of fluid and not just air. Based on the revised theory, they created a nonreciprocal acoustic device. In one direction sound moves though the device much more easily than in the other direction.
“The applications are endless,” Neogi says. “Acoustics, communications and stealth technology are all areas that will benefit from our findings.”
Neogi and Krokhin’s research was published by the Physical Review Letters journal. The collective of authors include UNT researchers Ezekiel Walker and Hyeonu Heo; Ph.D. students Andrii Bozhko and Yurii Zubov; and colleagues from Mexico and China.