Anisotropic diffraction of acoustic waves in crystals used in acousto-optic dispersive delay lines

Naumenko, Natalya; Chizhikov, S. I.; Molchanov, V. N.; Yushkov, Konstantin B.

doi:10.1109/ultsym.2013.0130

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…In the wave theory of diffraction it is known that in the Fraunhofer region (far-field approximation) the amplitude of a scalar field obeys the parabolic equation with an imaginary diffusion coefficient [10]. In anisotropic media, the diffusion coefficients are different for different directions in the beam cross-section, and they can be described using tensor algebra.…”

Section: General Analysismentioning

confidence: 99%

“…Explicit expressions for the components of the diffractional tensor c W in terms of invariants of the b K tensor are given in Ref. [10]. The eigenvalues W 1;2 can be positive, negative, zero or infinite.…”

Section: General Analysismentioning

confidence: 99%

“…Anisotropy of BAW diffraction in lithium niobate has not been studied before in detail despite a number of different BAW driven AO devices previously designed [5][6][7][8]. Diffractional properties BAWs in lithium niobate were analyzed only for the symmetry planes of the crystal [9,10]. Nevertheless, diffraction of BAWs can strongly affect the distribution of ultrasonic fields in the crystal and needs to be considered in the design of devices based on LiNbO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic diffraction of bulk acoustic wave beams in lithium niobate

et al. 2015

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Section: General Analysismentioning

confidence: 99%

Section: General Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic diffraction of bulk acoustic wave beams in lithium niobate

et al. 2015

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“…Several following examples illustrate intentional use of strong BAW anisotropy in ultrasonic devices. Anisotropic propagation of bulk acoustic waves in solids is used in the design of various acousto-optic devices [21,22,23,24,25,26,27]. There was an unusual situation.…”

Section: Introductionmentioning

confidence: 99%

Extreme acoustic anisotropy in crystals visualized by diffraction tensor

Науменко¹,

Yushkov²,

Molchanov³

2019

Preprint

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Acoustic wave propagation in single crystals, metamaterials and composite structures is a basic mechanism in acoustic, acousto-electronic and acousto-optic devices. Acoustic anisotropy of crystals provides a variety of device performances and application fields, but its role in pre-estimation of achievable device characteristics and location of crystal orientations with desired properties is often underestimated. A geometrical image of acoustic anisotropy can be an important tool in design of devices based on wave propagation in single crystals or combinations of anisotropic materials. We propose a fast and robust method for survey and visualization of acoustic anisotropy based on calculation of the eigenvalues of bulk acoustic wave (BAW) diffraction tensor (curvature of the slowness surface). The stereographic projection of these eigenvalues clearly reveals singular directions of BAW propagation (acoustic axes) in anisotropic media and areas of fast or slow variation of wave velocities. The method is illustrated by application to three crystals of different symmetry used in different types of acoustic devices: paratellurite, lithium niobate, and potassium gadolinium tungstate. The specific features of acoustic anisotropy are discussed for each crystal in terms of their potential application in devices. In addition, we demonstrate that visualization of acoustic anisotropy of lithium niobate helps to find orientations supporting propagation of high-velocity surface acoustic waves.

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“…Recent researches [1,2] show that ultrasonic beam features have a great impact on a design of ultrasonic devices including acousto-optic (AO) ones [3]. Real-time visualization of ultrasonic pulses in an anisotropic medium enables to clarify physical mechanisms governing behaviour of ultrasonic beams.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Acousto-Optic Visualization of Ultrasonic Pulses in TeO_2

et al. 2015

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The ultrasonic beam features in ultrasonic and acousto-optic devices have a great impact on their characteristics and need to be studied. In the current work, a conventional optical visualization technique was extended to include spatial ltration of the light diraction pattern and stroboscopic illumination of a unit under test. That enabled very weak light responses from ultrasonic waves to be observed. This technique was applied to studying propagation and reection of ultrasonic pulses in the TeO2 crystal, a body of the total internal reection ultrasonic sensor. Analysis of visualization data has revealed an unexpected conversion of the shear horizontal wave radiated by the transducer into a longitudinal one on its normal reection from the (001) face of the crystal, which is inexplicable as far as the plane wave theory is concerned. This nding requires further research to be conrmed and explained.

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Anisotropic diffraction of acoustic waves in crystals used in acousto-optic dispersive delay lines

Cited by 7 publications

References 9 publications

Anisotropic diffraction of bulk acoustic wave beams in lithium niobate

Anisotropic diffraction of bulk acoustic wave beams in lithium niobate

Extreme acoustic anisotropy in crystals visualized by diffraction tensor

Real-Time Acousto-Optic Visualization of Ultrasonic Pulses in TeO_2

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