EurekAlert  April 6, 2021 An international team of researchers (South Korea, Hong Kong) designed an artificial structure that can control not only the domain of underwater sound but also vibration. The research team has presented an underwater stealth metasurface independent from SONAR by controlling the acoustic resonance to absorb the wave. They also confirmed that the wave propagation through a curved plate, such as vibrations, can be drastically altered. Their methodology can achieve the cloaking effect with singularity of infinite refractive index. They designed a thin metasurface to absorb sound waves in broadband (14 kHz to 17 kHz). The metasurface […]