Tunable passband in one-dimensional phononic crystal containing a piezoelectric 0.62Pb(Mg1/3Nb2/3)O3–0.38PbTiO3 single crystal defect layer

Wang, Yuling; Song, Wenping; Sun, Enwei; Zhang, Rui; Cao, Wenwu

doi:10.1016/j.physe.2014.02.001

Cited by 39 publications

(25 citation statements)

References 32 publications

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“…As a defect, a 0.2mol% Fe-doped relaxor-based ferroelectric 0.62PB(MG 1/3 NB 1/3 )O 3 -0.38PBTIO 3 (PNM-0.38PT) layer was introduced into the structures. The use of this material allows to control, to a certain extent, the location of the transmission peaks as shown by (Wang et al (2014)). In the analyzed range of ultrasonic wave frequencies, there were from three to six transmission peaks for all types of structures.…”

Section: Discussionmentioning

confidence: 99%

Definition of principal material directions at irregular arterial shapes

2018

Engineering Mechanics

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Section: Discussionmentioning

confidence: 99%

Definition of principal material directions at irregular arterial shapes

2018

Engineering Mechanics

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“…Besides the above-mentioned three introduced materials, another smart material, which is the fourth introduced material, is the piezoelectric material, which is also dependent on electric fields like the dielectric elastomer, which has been extensively used in periodically laminated structures, i.e., one-dimensional (1D) piezoelectric layered phononic crystals. Because the electrical field is relatively easy to control and the piezoelectric effect is linear coupling between the electrical and mechanical fields, the elastic wave propagation and its tuning by the electrical conditions in periodically laminated piezoelectric composites have received extensive attention during the last two decades [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. The earlier literatures on this topic only considered the relatively simple electrical boundaries, i.e., the electric-open and electric-short conditions.…”

Section: Introductionmentioning

confidence: 99%

Band Structures Analysis of Elastic Waves Propagating along Thickness Direction in Periodically Laminated Piezoelectric Composites

Guo

Wang

et al. 2018

Crystals

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Existing studies on elastic waves in periodically laminated piezoelectric structures mainly concerned the passive band properties, since the electrical boundaries in the considered structures cannot vary. This paper investigates the tuning of band properties of uncoupled primary and shear (P- and S-) waves along the thickness direction by actively varying the electrical field in periodically multilayered piezoelectric structures consisting of orthotropic materials. The alteration of the electrical field is realized in the multilayered unit cell here by either applying or switching four kinds of electrical boundary conditions, including the electric-open, applied electric capacitance, electric-short, and applied feedback voltage, to the constituent piezoelectric layer via the constituent electrode layers covering both its surfaces. First, the state space formalism is introduced to obtain the partial wave solution of any constituent orthotropic layer in the unit cell. Second, the traditional transfer matrix method is adopted to derive the dispersion equation of general, periodically laminated piezoelectric composites with unit cells consisting of an arbitrary number of piezoelectric layers with various boundaries and of elastic layers. Third, numerical examples are provided to verify the proposed analysis method, and to study the influences of electrode thickness as well as four electrical boundaries on the band structures. All the frequency-related dispersion curves are also illustrated by numerical examples to summarize the general dispersion characteristics of uncoupled P- and S-waves in periodically laminated piezoelectric composites. The main finding is that the innovative dispersion characteristic resulting from the negative capacitance may also be achieved via feedback control.

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“…More specifically, modifying the contrast in material parameters of a crystal, or changing the physical arrangement of components, manifests in the transmission spectrum and band structure to show the effects on transient sound. Active sonic structures with applied static electric fields, [14][15][16] magnetically, [17][18][19] mechanically 20,21 and recently with infrared radiation 22 have been reported. Most of these active sonic structures are in physical contact with the actuating source.…”

Section: Introductionmentioning

confidence: 99%

Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

Walker

Wang²,

Neogi

2017

NPG Asia Mater

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Radio-frequency (RF) control of an ultrasonic phononic crystal was achieved by encapsulating it in a composite of high k-10% KF-doped BaTiO 3 dielectric nanoparticles with poly(N-isopropylacrylamide) (PNIPAm)-based hydrogel. The combination of the nanoparticles and hydrogel produced a composite with elastic properties susceptible to RF actuation. The novel acoustic meta-material enables the regulation of sound waves by electromagnetic waves, which is not possible in a conventional medium as elasto-mechanical waves, and electromagnetic waves do not directly couple. Compared with light waves, radio waves can penetrate deeper into bulk structures and enable the control of propagation of ultrasonic waves through a macroscale phononic crystal. An RF antenna emitting at 318.6 and 422.5 kHz was used to modulate the device in water and ambient air, respectively. An increased transparency of the ultrasonic wave in the material was observed due to an increase in the bandwidth of the modulated device exceeding 8 kHz with a 30-fold increase in the signal modulation at select frequencies. The radio waves induced changes in the transmission and demonstrated the control of ultrasound with applied RF. The synthetic acoustic properties in the resultant meta-material device were actively manipulated through the interaction of electromagnetic waves with the material.

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Tunable passband in one-dimensional phononic crystal containing a piezoelectric 0.62Pb(Mg1/3Nb2/3)O3–0.38PbTiO3 single crystal defect layer

Cited by 39 publications

References 32 publications

Definition of principal material directions at irregular arterial shapes

Definition of principal material directions at irregular arterial shapes

Band Structures Analysis of Elastic Waves Propagating along Thickness Direction in Periodically Laminated Piezoelectric Composites

Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

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