Mass-stiffness substructuring of an elastic metasurface for full transmission beam steering

Lee, Hyuk; Lee, Jun Kyu; Seung, Hong Min; Kim, Yoon Young

doi:10.1016/j.jmps.2017.11.025

Cited by 131 publications

(57 citation statements)

References 52 publications

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“…The actual wave propagating in the plate is the lowest symmetric Lamb wave ( S 0 ) in the frequency of interest. As demonstrated in earlier works 6 , 16 , 30 , the one-dimensional longitudinal wave has a good correspondence to the S 0 wave. Therefore, the wave motion in the plate will be modeled using one-dimensional longitudinal waves in a bar, as depicted in Fig.…”

Section: Resultssupporting

confidence: 74%

“…To realize extraordinary wave phenomena, these material properties have been manipulated by various means including metamaterials 1 – 6 . For instance, the effective impedance ( or ) can be manipulated for perfect matching 7 – 10 and the phase velocity 11 – 16 ( or ) can be manipulated for tunneling and other applications. While zero-index metamaterials requiring extreme effective material properties such that ρ / E → 0 ( με → 0) are reported 13 , 14 , 17 – 19 , another extreme case of zero or near-zero impedance requiring that is little studied.…”

Section: Introductionmentioning

confidence: 99%

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Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing

et al. 2018

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In spite of the extensive studies of zero-index metamaterials, the realization of zero impedance with finite phase velocity has not been explored. Here, we show that this extreme case, realized by elaborately-tuned paired resonators, can effectively enhance sensing and actuation. To explain the formation mechanism of the near-zero effective impedance with finite phase velocity by paired resonators at a target frequency, a theory using an equivalent model based on mechanical longitudinal waves is developed. If the frequency of the extreme property is further tuned at a Fabry–Pérot resonance frequency, highly efficient enhancement is possible. Experiments using a piezoceramic transducer (PZT) installed on the plate region bounded by two resonators confirm that the proposed extreme property mechanism highly enhances the sensing and actuation outputs of the transducer.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing

et al. 2018

Self Cite

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“…By adjusting the negative capacitances online, discontinuous phase profiles can be obtained. A full transmission MS for in-plane longitudinal waves has also been introduced [153]; its unit cell is composed of separated substructures, so that each property is decoupled by its own geometrical parameter ( Figure 12d); therefore, each substructure embedded in elastic solids behaves as a mass or as a spring element. Full transmission was achieved by breaking an intrinsic proportionally-coupled relationship between density and stiffness.…”

Section: Elastic Metasurfacesmentioning

confidence: 99%

Recent Advances in Non-Traditional Elastic Wave Manipulation by Macroscopic Artificial Structures

2020

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Metamaterials are composed of arrays of subwavelength-sized artificial structures; these architectures give rise to novel characteristics that can be exploited to manipulate electromagnetic waves and acoustic waves. They have been also used to manipulate elastic waves, but such waves have a coupling property, so metamaterials for elastic waves uses a different method than for electromagnetic and acoustic waves. Since researches on this type of metamaterials is sparse, this paper reviews studies that used elastic materials to manipulate elastic waves, and introduces applications using extraordinary characteristics induced by metamaterials. Bragg scattering and local resonances have been exploited to introduce a locally resonant elastic metamaterial, a gradient-index lens, a hyperlens, and elastic cloaking. The principles and applications of metasurfaces that can overcome the disadvantages of bulky elastic metamaterials are discussed.

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“…However, the extension of this mechanism to manipulating elastic waves in solid is not straightforward. In addition, other design requirements that are crucial in practical applications such as high transmission efficiency, [ 3,39 ] robust performance should be considered, which further complicates the design.…”

Section: Introductionmentioning

confidence: 99%

Frequency‐Coded Passive Multifunctional Elastic Metasurfaces

Rong

Zhang

et al. 2020

Adv Funct Materials

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As an emerging material, metasurfaces open the door to a wide range of applications based on ultrasonic and elastic waves. However, most of the existing elastic metasurfaces have a fixed functionality and operate at a fixed frequency, which make them difficult to adapt to changing working requirements and/or environments. Although several recently proposed reconfigurable designs can relax this limitation, they either need laborious tuning or complex active control systems. In this work, by encoding multiple functionalities onto a single metasurface through operation frequencies, passive metasurfaces with switchable multifunctionalities are proposed and realized. Different wave manipulation functions of a single metasurface can be switched from one to another simply by changing the operation frequency. The design of these metasurfaces is realized using a systematic design approach based on topology optimization. Frequency-coded multiple elastic wave manipulation functions, including wave beam steering and focusing, are numerically and experimentally demonstrated. Good agreement between the numerical simulations and experimental measurements is achieved. The proposed design strategy significantly enhances the functionalities and adaptivity of metasurfaces, moving them closer towards real-world applications.

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Mass-stiffness substructuring of an elastic metasurface for full transmission beam steering

Cited by 131 publications

References 52 publications

Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing

Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing

Recent Advances in Non-Traditional Elastic Wave Manipulation by Macroscopic Artificial Structures

Frequency‐Coded Passive Multifunctional Elastic Metasurfaces

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