Ultrasonic engine based on traveling waves in a plate

Journal of Applied Physics

Nadtochiy

2006

Self Cite

A multidomain two-dimensional periodically poled ferroelectric plate vibrator is reported for the first time. The theoretical calculations, computer simulations by the Finite Element Method and experimental data from the lithium tantalite samples reveal a domain acousto-electric resonance. A polarization inversion in a y-rotated cut of a ferroelectric chip is firstly done. The acousto-electric characteristics of the vibrator are calculated and measured. Introduction. Multidomain ferroelectrics are the subjects of the rigorous fundamental physical investigations and possible applications during last decades since the first publications on fabrication of the periodic inversely poled structures [1-5]. Main areas of research are the fabrication of inversely poled micro-domains in bulk ferroelectric crystals, which are sometime referred to as one dimensional acoustic super-lattice, and their applications for ultrasonic transducers [6-12]. Different oxygen-octahedral ferroelectric crystals (LiNbO 3 , LiTaO 3 , KTiOPO 4 , and BaTiO 3 ) with the periodic domain structures have been reported [1, 3, 4, 9, 12, 13] in a one-dimensional bulk media. Scanning Electron Microscopy technique was employed to show a significant interaction of the surface acoustic waves propagating in a periodically poled lithium niobate [14], which results in some nonlinear effects [15]. The domain walls and associated complexes of crystal lattice defects are reported [16] to be responsible for a new type of nonlinear ultrasonic attenuation in lithium niobate. Last years a fabrication of the ferroelectric domains at the nanoscale is of great interest [17] view the potential applications in information storage devices and ferroelectric memory cells. The optical properties and generation of optical harmonics in periodic ferroelectric structures is another important application. At this point we want to mention a new type of polariton [18] discovered in a piezoelectric superlattice [1, 19].In point of fact, we can not refer to any publication on acoustoelectric properties of multidomain ferroelectric structures in two-dimensional ferroelectric resonators.

Section: Multidomain Periodically Poled Ferroelectric Plate (Theory)mentioning

confidence: 89%

“…Piezoelectric properties of a plate material are given by the equations (3) and (4). [21,22]. The zero symmetrical mode has phase speed V = 5.9·10 z u x u 5 cm/sec.…”

Section: Multidomain Periodically Poled Ferroelectric Plate (Theory)mentioning

confidence: 99%

Free vibration of periodically poled ferroelectric plate

Journal of Applied Physics

Nadtochiy

2006

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“…21,22 A zero symmetrical ͑S 0 ͒ mode in a standard 0.35mm-thick chip of lithium tantalite turns to be a low dispersion wave at the frequencies lower than 5 MHz. We omit below the superscripts E and S at the elastic modules and permittivity.…”

mentioning

confidence: 99%

Domain resonance in two-dimensional periodically poled ferroelectric resonator

Applied Physics Letters

Nadtochiy

2005

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Application of the second harmonic generation microscope to nondestructive observation of periodically poled ferroelectric domains in quasi-phase-matched wavelength converters A two-dimensional periodically poled ferroelectric resonator is reported. The theoretical calculations, computer simulations by the finite element method and experimental data from the lithium tantalite samples reveal a domain acoustoelectric resonance. A polarization inversion in a y-rotated cut of a ferroelectric chip is done. A distribution of an electric potential over crystal surface may be an effective experimental tool for characterization of the periodically poled ferroelectrics.

Resonances in ferroelectric phononic superlattice

Applied Physics Letters

Cremaldi

2012

The periodically poled ferroelectric wafer is a two-dimensional phononic superlattice. The important applications of such a solid include ultrasonic transducers at the micro/nano-scale for low intensity ultra-sonography, ferroelectric data storage, and development of very high frequency chips for next generation communication and information technologies, and others. In this work, we show theoretically and experimentally that a ferroelectric phononic superlattice has two distinctive resonances in acousto-electric transformation. They are associated with a split acoustic mode at the boundary between the first and second acoustic Brillouin zone.