image: A compilation image of different acoustic metamaterials. The background shows a close-up image of an array of silicone-coated metal spheres, widely regarded as the first acoustic metamaterial that incorporated localized resonances. The color images are, from left to right: displacement profiles of a decorated membrane, pressure field map of a double-negative acoustic superlens, an acoustic hyperlens, and a negative-refractive acoustic metasurface. This material relates to a paper that appeared in the Feb. 26, 2016, issue of Science, published by AAAS. The paper, by G. Ma at Hong Kong University of Science and Technology in Hong Kong, China, and colleagues was titled, "Acoustic metamaterials: From local resonances to broad horizons." view more
Credit: Guancong Ma