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Sci Rep. 2015 Jul 17;5:12139. doi: 10.1038/srep12139.

Theoretical requirements for broadband perfect absorption of acoustic waves by ultra-thin elastic meta-films.

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College of Physics, Optoelectronics and Energy &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.
School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong.


We derive and numerically demonstrate that perfect absorption of elastic waves can be achieved in two types of ultra-thin elastic meta-films: one requires a large value of almost pure imaginary effective mass density and a free space boundary, while the other requires a small value of almost pure imaginary effective modulus and a hard wall boundary. When the pure imaginary density or modulus exhibits certain frequency dispersions, the perfect absorption effect becomes broadband, even in the low frequency regime. Through a model analysis, we find that such almost pure imaginary effective mass density with required dispersion for perfect absorption can be achieved by elastic metamaterials with large damping. Our work provides a feasible approach to realize broadband perfect absorption of elastic waves in ultra-thin films.

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