Harnessing Deformation to Switch On and Off the Propagation of Sound

Babaee, Sahab; Viard, Nicolas; Wang, Pai; Fang, Nicholas X.; Bertoldi, Katia

doi:10.1002/adma.201504469

Cited by 158 publications

(88 citation statements)

References 39 publications

(37 reference statements)

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“…3D structures formed via origami, [33, 34] buckling, [35–38] and 3D printing [39] have attracted significant attentions due to their wide range of applications such as microphysiological systems, [39] cell studies, [40, 41] bio-mimic actuators, [42, 43] and the control of wave propagation. [44, 45] However, their applications in MEMS resonators and energy harvesters remain to be fully explored.…”

Section: Introductionmentioning

confidence: 99%

3D Tunable, Multiscale, and Multistable Vibrational Micro‐Platforms Assembled by Compressive Buckling

Ning

Wang

et al. 2017

Adv Funct Materials

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Microelectromechanical systems remain an area of significant interest in fundamental and applied research due to their wide ranging applications. Most device designs, however, are largely two-dimensional and constrained to only a few simple geometries. Achieving tunable resonant frequencies or broad operational bandwidths requires complex components and/or fabrication processes. The work presented here reports unusual classes of three-dimensional (3D) micromechanical systems in the form of vibratory platforms assembled by controlled compressive buckling. Such 3D structures can be fabricated across a broad range of length scales and from various materials, including soft polymers, monocrystalline silicon, and their composites, resulting in a wide scope of achievable resonant frequencies and mechanical behaviors. Platforms designed with multistable mechanical responses and vibrationally de-coupled constituent elements offer improved bandwidth and frequency tunability. Furthermore, the resonant frequencies can be controlled through deformations of an underlying elastomeric substrate. Systematic experimental and computational studies include structures with diverse geometries, ranging from tables, cages, rings, ring-crosses, ring-disks, two-floor ribbons, flowers, umbrellas, triple-cantilever platforms, and asymmetric circular helices, to multilayer constructions. These ideas form the foundations for engineering designs that complement those supported by conventional, microelectromechanical systems, with capabilities that could be useful in systems for biosensing, energy harvesting and others.

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Section: Introductionmentioning

confidence: 99%

3D Tunable, Multiscale, and Multistable Vibrational Micro‐Platforms Assembled by Compressive Buckling

Ning

Wang

et al. 2017

Adv Funct Materials

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“…Therefore, to modulate the spatial extension of the defect modes, one may need to modify the crystal defect. However, actively tuning the spatial extension of a defect mode is by no means trivial, because when the external stimuli, e.g., the mechanical loads [15][16][17], temperature field [18] or magnetic field [19] are adopted to shift the band gaps of common PCs, they proportionally shift the frequencies of the defect modes as well [13]. To address this challenge, recently Lydon et al [13] have introduced a resonant defect in a granular crystal and demonstrated that the spatial extension of the defect mode can be actively controlled [13].…”

Section: Introductionmentioning

confidence: 99%

Tunable defect mode in a soft wrinkled bilayer system

Zheng

Cao

2016

Extreme Mechanics Letters

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Here we study the defect mode in a wrinkled soft bilayer induced by a local geometrical defect introduced into the system. We show that the band gap of the studied composite system depends on the wrinkling-induced stress pattern and is not sensitive to the compression strain ε in the given loading range. However, the frequency of the defect mode apparently varies with ε . This interesting phenomenon enables us to widely tune the spatial extension of the defect mode from highly localized to completely extended by simply controlling the imposed external load.Our strategy to create a tunable defect mode in a soft layered composite is simple and straightforward and may find such broad applications as the development of advanced soft metamaterials and corresponding devices.

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“…4a, an array of elastomeric helices manufactured from a molding and casting method can reconfigure its pitch and diameter in an approximately linear manner upon external loading. 57 The solid fraction in such structure decreases with applied tensile strain. For a square array, an acoustic band gap in its undeformed configuration disappears when the stretching reaches 0.9.…”

mentioning

confidence: 98%

Reconfigurable systems for multifunctional electronics

2017

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Reconfigurable systems complement the existing efforts of miniaturizing integrated circuits to provide a new direction for the development of future electronics. Such systems can integrate low dimensional materials and metamaterials to enable functional transformation from the deformation to changes in multiple physical properties, including mechanical, electric, optical, and thermal. Capable of overcoming the mismatch in geometries and forms between rigid electronics and soft tissues, bio-integrated electronics enabled by reconfigurable systems can provide continuous monitoring of physiological signals. The new opportunities also extend beyond to human-computer interfaces, diagnostic/therapeutic platforms, and soft robotics. In the development of these systems, biomimicry has been a long lasting inspiration for the novel yet simple designs and technological innovations. As interdisciplinary research becomes evident in such development, collaboration across scientists and physicians from diverse backgrounds would be highly encouraged to tackle grand challenges in this field.

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Harnessing Deformation to Switch On and Off the Propagation of Sound

Cited by 158 publications

References 39 publications

3D Tunable, Multiscale, and Multistable Vibrational Micro‐Platforms Assembled by Compressive Buckling

3D Tunable, Multiscale, and Multistable Vibrational Micro‐Platforms Assembled by Compressive Buckling

Tunable defect mode in a soft wrinkled bilayer system

Reconfigurable systems for multifunctional electronics

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