News Column

Researchers at Korea Institute of Machinery and Materials Discuss Findings in Science

May 23, 2014

By a News Reporter-Staff News Editor at Science Letter -- Data detailed on Science have been presented. According to news reporting from Daejeon, South Korea, by NewsRx journalists, research stated, "The emission enhancement of sound without electronic components has wide applications in a variety of remote systems, especially when highly miniaturized (smaller than wavelength) structures can be used. The recent advent of acoustic metamaterials has made it possible to realize this."

The news correspondents obtained a quote from the research from the Korea Institute of Machinery and Materials, "In this study, we propose, design, and demonstrate a new class of acoustic cavity using a double-walled metamaterial structure operating at an extremely low frequency. Periodic zigzag elements which exhibit Fabry-Perot resonant behavior below the phononic band-gap are used to yield strong sound localization within the subwavelength gap, thus providing highly effective emission enhancement. We show, both theoretically and experimentally, 10 dB sound emission enhancement near 1060 Hz that corresponds to a wavelength approximately 30 times that of the periodicity. We also provide a general guideline for the independent tuning of the quality factor and effective volume of acoustic metamaterials."

According to the news reporters, the research concluded: "This approach shows the flexibility of our design in the efficient control of the enhancement rate."

For more information on this research see: Emission enhancement of sound emitters using an acoustic metamaterial cavity. Scientific Reports, 2014;4():4165. (Nature Publishing Group -; Scientific Reports -

Our news journalists report that additional information may be obtained by contacting K. Song, Dept. of Nature-Inspired Nanoconvergence Systems, Korea Institute of Machinery and Materials, 156 Gajeongbuk-Ro, Daejeon, 305-343, South Korea. Additional authors for this research include S.H. Lee, K. Kim, S. Hur and J. Kim (see also Science).

Keywords for this news article include: Asia, Daejeon, Science, South Korea.

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Source: Science Letter

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