期刊
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
卷 206, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2021.106619
关键词
Elastic metamaterial; Complementary metamaterial; Wave property engineering; Ultrasonic barrier; Wave transmission
资金
- National Research Foundation of Korea (NRF) - Korean Ministry of Science, ICT and Future Planning (MSIP) through IAMD at Seoul National University [2014M3A6B3063711]
- Main Project of Korea Institute of Machinery and Materials [NK228B]
- National Research Council of Science & Technology (NST), Republic of Korea [NK228B] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A new complementary meta-layer (CML) is proposed to enhance ultrasound transmission efficiency by canceling out barriers of diverse impedances. Numerical simulations show significantly improved ultrasound transmission efficiency, suggesting groundbreaking potential for various ultrasound applications.
Efficient ultrasound transmission is crucial in vast areas including noninvasive surgery, structural health monitoring, and underwater detection. However, extreme impedance contrast of interfering media spanning from solid to liquid and even gas seriously harms ultrasound transmission efficiency. Here, we propose a complementary meta-layer (CML) to virtually cancel out not only dissimilar solid but also liquid and gas barriers for highly enhanced transmission through the barriers in wave propagation perspective. Our proposition is apparently the first elastic CML and it is uniquely designed in a monolayer. The meta-atom forming a single meta-layer consists of spatially separated dipolar and monopolar resonators with completely independent tunability of effective negative properties. The proposed CML is capable of enhancing the ultrasound transmission by 593%, 1426%, and 3280% respectively for the polymer, water, and air barriers by numerical simulations. The proposed methodology to cancel out diverse barriers of highly dissimilar impedances can be groundbreaking in various ultrasound applications.
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