Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.044302
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Funding
- Center for Advanced Meta-Materials (CAMM) - Ministry of Science, ICT, and Future Planning [CAMM-2014M3A6B3063712]
- National Research Foundation of Korea(NRF) - Korea government (MSIP) [2015001948]
- Grants-in-Aid for Scientific Research [16H02123] Funding Source: KAKEN
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Effective transmission of sound from water to air is crucial for the enhancement of the detection sensitivity of underwater sound. However, only 0.1% of the acoustic energy is naturally transmitted at such a boundary. At audio frequencies, quarter-wave plates or multilayered antireflection coatings are too bulky for practical use for such enhancement. Here we present an acoustic metasurface of a thickness of only similar to lambda/100, where lambda is the wavelength in air, consisting of an array of meta-atoms that each contain a set of membranes and an air-filled cavity. We experimentally demonstrate that such a meta-atom increases the transmission of sound at similar to 700 Hz by 2 orders of magnitude, allowing about 30% of the incident acoustic power from water to be transmitted into air. Applications include underwater sonic sensing and communication.
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