Flexible and elastic metamaterial absorber for low frequency, based on small-size unit cell

Yoo, Young Joon; Zheng, Haiyu; Kim, Y. J.; Rhee, Joo Yull; Kang, Ju-Hyung; Kim, K. W.; Cheong, Hyeonsik; Kim, Y. H.; Lee, Y. P.

doi:10.1063/1.4885095

Cited by 130 publications

(58 citation statements)

References 29 publications

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“…Metamaterial, defined as artificial structures that exhibit physical properties not available in natural material, has extraordinary capability in low-frequency sound/vibration attenuation, negative refraction, and super lenses (Landy et al, 2008;Pendry and Li, 2008;Yang et al, 2010;Yoo et al, 2014). The acoustic metamaterial, consisting of periodically arranged local microstructures or unit-cells integrated to a host medium, can manipulate elastic wave propagation.…”

Section: Introductionmentioning

confidence: 98%

Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Xu¹,

Li²,

Tang³

2017

Active and Passive Smart Structures and Integrated Systems 2017

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Due to the attractive potential in elastic wave attenuation and wave guiding, acoustic metamaterials have received much attention.Different from the more conventional metamaterials that possess only mechanical displacement/deformation, the electro-mechanical metamaterials analyzed in this paper utilize the two-way electromechanical coupling of piezoelectric transducers and local resonance induced by LC (inductor-capacitor) shunt circuits, which features enlarged design space as well as adaptivity. We report an adaptive piezoelectric gradient index (GRIN) lens featuring focusing acoustic wave. The proposed GRIN lens is comprised of arrayed piezoelectric unit-cells with individually connected inductive shunt circuits. Taking advantage of wave velocity shifting in the vicinity of local resonant frequency of unit-cell and specifically arranged LC shunt circuits, we can focus the transverse wave adaptively by adjusting the inductive loads, i.e., tuning the inductances. Analytical investigations and finite element simulations are performed. This tunable GRIN lens can be used as acoustic metamaterial for various acoustic devices operating with broadband frequencies.

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Section: Introductionmentioning

confidence: 98%

Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Xu¹,

Li²,

Tang³

2017

Active and Passive Smart Structures and Integrated Systems 2017

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“…Email: ghasemi.masih61@gmail.com inside the metamaterial structure [11] and have been proved to be more efficient over conventional absorbers because of being trendy in size. [12] After the work by Landy et al [11], investigators proposed varieties of other forms of such absorbers for different kinds of applications, viz. broadband absorbers, multiband absorbers, polarization insensitive absorbers, tunable band absorbers, etc.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of nanostructured subwavelength metamaterial absorber operating in the UV and visible spectral range

Baqir¹,

Ghasemi²,

Choudhury³

et al. 2015

Journal of Electromagnetic Waves and Applications

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2015): Design and analysis of nanostructured subwavelength metamaterial absorber operating in the UV and visible spectral range, Journal of Electromagnetic Waves and Applications,The design of broadband metamaterial perfect absorber (MPA) is proposed that operates in the ultraviolet and the visible regions of the electromagnetic spectrum. The MPA structure is of nanoscale in size and comprised of three layers -the U-shaped resonators (made of gold) of subwavelength size are embedded over a nanolayer of dielectric medium (silica glass), which is backed by a copper nanolayer surface. It is found that the proposed structure yields absorption peaks with the absorptivity over 99% in the aforesaid spectral range corresponding to both the transverse electric and the transverse magnetic polarizations of the incident electromagnetic wave. Furthermore, the angular dependence (of the incident light) of absorption characteristics is also analyzed along with the behavior of the absorber under varying thickness of nanosized resonators. It is expected that the proposed kind of perfect absorber would be highly useful in integrated heat-absorbing mediums that would include sensors, integrated photodetectors, thermal imaging, solar cells, etc.

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“…The metamaterial, defined as artificial structures that exhibit physical properties not available in natural material, has extraordinary capability in low-frequency sound/vibration attenuation, negative refraction, and acoustic/elastic lenses [17][18][19][20][21][22][23][24]. Note that phase velocity of an acoustic wave in metamaterial undergoes significantly shifting in the vicinity of local resonance [25,26].…”

Section: Research Overviewmentioning

confidence: 99%

Acoustic prism for continuous beam steering based on piezo-electric metamaterial

Xu¹,

Tang²

2016

SPIE Proceedings

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This paper investigates an acoustic prism for continuous acoustic beam steering by a simple frequency sweep. This idea takes advantages of acoustic wave velocity shifting in metamaterials in the vicinity of local resonance. We apply this concept into the piezoelectric metamaterial consisting of host medium and piezoelectric LC shunt. Theoretical modeling and FEM simulations are carried out. It is shown that the phase velocity of acoustic wave changes dramatically in the vicinity of local resonance. The directions of acoustic wave can be adjusted continuously between 2 to 16 degrees by a simple sweep of the excitation frequency. Such an electro-mechanical coupling system has a feature of adjusting local resonance without altering the mechanical part of the system. Keywords: Acoustic metamaterial, acoustic prism, LC shunt circuit, beam steering, local resonance. BACKGROUNDStructural health monitoring (SHM) aims at utilizing autonomous damage detection strategies to monitor a structure in real time. A SHM system consists of sensors and actuators with data acquisition, computation and signal interpretation modules. Many types of actuators and sensors have been adopted including, for example, the piezoelectric transducers, fiber composites, magnetostrictive materials and fiber optics. Among these, piezoelectric transducers have received significant attention due to its compactness, wide bandwidth, and good linearity within functional range [1][2][3]. The piezoelectric transducers are commonly used in the impedance based and the guided wave based SHM systems. Towards the impedance based method, electrical impedance of the piezoelectric transducer bonded to structure is measured. Due to the two-way electromechanical coupling effect, the damage induced mechanical impedance changes can be reflected in the electrical impedance shifting [4,5]. The impedance based method has advantages of simple configuration, low power consumption, and independent on an analytical model for implementation [4][5][6][7]. Alternatively, the guided wave propagation approach shows better feasibility in far field damage detection [8][9][10]. This is because the guided Lamb waves have the advantage of wave propagation over long distances with little loss of amplitude. Consequently, it is not required to place the actuators or sensors in the vicinity of damages. By extending the guided wave method into 2-or 3-dimensional space, the phased array techniques arise and have been subject to wide exploration. In the phased array method, the surface bonded actuators focus the wave energy on localized directions or areas by controlled excitation time delay of each array element [11][12][13][14][15]. The beam forming direction reorientation can be achieved by altering the excitation time sequences. Nevertheless, this method needs complicate and precise control coordination. Due to the demand of low cost acoustic beam steering, a frequency-based beam steering method has been proposed in a recent study by utilizing periodic array of piezoelectric act...

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Flexible and elastic metamaterial absorber for low frequency, based on small-size unit cell

Cited by 130 publications

References 29 publications

Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Design and analysis of nanostructured subwavelength metamaterial absorber operating in the UV and visible spectral range

Acoustic prism for continuous beam steering based on piezo-electric metamaterial

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