![]() ![]() However, there is a new material that allows acoustic waves to pass through, remaining safe and undetected.Ī research team composed of Wonjae Choi, a senior researcher at the Center for Safety Measurement of Korea Research Institute of Standards and Science (KRISS, President Sang-Ryoul Park) and Semyung Wang, a professor in the Department of Mechanical Engineering of Gwangju Institute of Science and Technology (GIST, President Seung Hyeon Moon), developed a double-zero-index metamaterial and successfully conducted experiments in a water tank. Acoustic waves are reflected off the surface of an object. # Underwater Objects, which cannot be reached by electromagnetic waves or radar, are detected based on reflected acoustic waves. Double-zero-index metamaterial passes acoustic waves without reflection. ![]() Underwater Stealth technology becomes possible
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