Science Daily December 13, 2019 An international team of researchers (USA – City College of New York, Russia) has shown that long-range interactions in the metamaterial changes the common behavior of light waves forcing them to localize in space. The study shows that by controlling the degree of such interactions one can switch between trapped and extended (propagating) character of optical waves. The new approach to trap light allows the design of new types of optical resonators, which may have significant impact on antennas in smartphones and Wi-Fi routers, and optical chips in optoelectronics used for transferring data over the […]
Tag Archives: Metamaterials
Researchers develop ‘acoustic metamaterial’ that cancels sound
Phys.org March 7, 2019 Based on the premise that metamaterial needs to be shaped in such a way that it sends incoming sounds back to where they came from, researchers at Boston University calculated the dimensions and specifications that the metamaterial would need to have in order to interfere with the transmitted sound waves. Using the calculation they created a structure made of plastic that could silence sound from a loudspeaker. In tests they found that 94 percent of the sound emanating from the loudspeaker was imperceptible to the human ear. The shape of acoustic-silencing metamaterials is also completely customizable. […]
‘Meta-mirror’ reflects sound waves in any direction
Science Daily March 7, 2019 To break the law of reflection with sound waves, an international team of researchers (Finland, USA – Duke University) designed a meta-mirror out of plastic with precisely etched channels on the surface of the metamaterial. Between the meta-mirror’s shape and the depth of its channels, the interference pattern results in the sound wave reflecting in a desired direction without any of its energy being absorbed or scattered in an unwanted direction. In demonstration the device reflected a soundwave traveling directly toward it at 3,000 Hertz and perfectly reflects it at an angle of 70 degrees. […]