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Perfect absorption of flexural waves induced by bound state in the continuum
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DOI：10.1016/j.eml.2021.101364.png)
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Abstract
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Conventional vibration absorber is challenging to use in the extreme environment of high (low) temperature, due to the low tolerance of its additional damping material to temperature. To adapt to the extreme environment, here we propose an elastic meta-absorber (EMA) based on the quasi-bound states of the continuum (BICs) physical approach. The proposed absorber does not have any additional damping material, depends only on the extreme-low structural loss, and is capable of achieving perfect absorption of the flexural waves propagating in an elastic beam. The proof-of-concept we provide consists of three parallel subwavelength sub-beams sharing a single-port radiating channel in a host beam, and supports elastic Friedrich-Wintgen quasi-BICs. Based on the latter, the subwavelength EMA can achieve a high quality factor in the elastic wave system to enhance, in an unprecedented way, the wave energy dissipation. Using this physical mechanism, we experimentally and numerically validate and demonstrate the perfect absorption of flexural waves at subwavelength regime. Our work opens a new route to deal with vibration absorption with subwavelength structures in specific and extreme environments. (c) 2021 Elsevier Ltd. All rights reserved.
Keywords:
Bound state in the continuum (BIC)
Flexural wave
Perfect absorption
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