Improved material constants for LiNbO/sub 3/ and LiTaO/sub 3/

Kovacs, G.; Anhorn, M.; Engan, Helge E.; Visintini, G.; Ruppel, C.C.W.

doi:10.1109/ultsym.1990.171403

Cited by 251 publications

(108 citation statements)

References 10 publications

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“…The experimental results and the slowness curve computed using materials parameters for LiNbO 3 [14] are in good agreement. The simulations also predict a gap between the calculated projection of the sound cone for the bulk waves and the slowness curve for the SAW, as observed experi-mentally (see Fig.…”

Section: Wave Slowness From Random Saw Fieldssupporting

confidence: 60%

“…The diffraction grating technique was a popular approach in the 1970s [5][6][7], but has not been widely used recently. The knife-edge technique has also been successfully applied by many authors to investigate wave propagation, for example to separate propagating and standing wave contributions, to measure SAW velocities, attenuation, beam steering and diffraction [8][9][10][11][12][13][14][15][16]. For a recent implementation of this technique to phase-sensitive optical probing of SAW vibration fields and data-analysis, see Refs.…”

Section: Optical Characterization Of Surface Vibrationsmentioning

confidence: 99%

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Measurement of evanescent wave properties of a bulk acoustic wave resonator [Letters]

Kokkonen

Meltaus

Pensala

et al. 2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Aalto University publication series DOCTORAL DISSERTATIONS 112/2014 © Kimmo Kokkonen AbstractThe research summarized in this dissertation focuses on the development of a heterodyne scanning laser interferometer and of data-analysis techniques for the characterization and analysis of the surface vibration fields in microacoustic devices and test structures.The heterodyne laser interferometer enables a phase-sensitive, absolute-amplitude detection of the out-of-plane component of a surface vibration field, with a minimum detectable amplitude of less than a picometer, while the lateral resolution is better than 1 micrometer. The instrument features a flat frequency response up to 6 GHz.The phase-sensitive absolute-amplitude data enables the visualization of the actual wave behavior in electromechanical components and test structures, but more importantly, it is the basis for further analysis. The research instrument is applied to the study of electroacoustic devices based on surface acoustic wave (SAW) and bulk acoustic wave (BAW) technologies. Two novel SAW devices are studied in detail: a phononic crystal (PnC) structure and a scattering structure resulting in a random wave field. PnCs are acoustic metamaterials that can provide engineered material properties. The laser interferometric measurements were amongst the first to directly characterize the wave interaction with the PnC. SAW slowness curves of an anisotropic substrate material are extracted by measuring and analyzing the scattered random wave field. Data analysis methods are developed further in the context of BAW research by experimentally addressing two important aspects of device design: the correct operation of the acoustic reflector used to confine the energy in the resonator, and investigation of the role of the dispersion and standing wave resonances to the spurious responses often observed in high-Q resonators. Fourier transform techniques are used for selective visualization of wave fields and for the extraction of the dispersion characteristics of the plate-waves. The dispersion data are then further used to analyze the transfer characteristics of an acoustic reflector and to study the properties of lateral eigenresonances and the lateral energy confinement in detail.The research described in this thesis provides a detailed characterization of the operation of SAW and BAW devices and effects within, highlighting and further developing the experimental characterization capabilities and data-analysis methods.Keywords laser interferometry, microacoustics, surface acoustic waves, bulk acoustic waves Tiivistelmä Väitöskirjatyö käsittelee heterodyne-tyyppisen laserinterferometrin sekä interferometrin tuottaman datan analyysitekniikoiden kehittämistä pintavärähtelykenttien karakterisoimiseksi ja analysoimiseksi mikroakustisissa komponenteissa ja testirakenteissa.Työssä rakennettu heterodynelaserinterferometri mahdollistaa pintavärähtelyiden vaiheherkät absoluuttiamplitudimittaukset aina 6 GHz taajuuteen asti. Laitteisto kykenee värähtely-kenttien k...

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Section: Wave Slowness From Random Saw Fieldssupporting

confidence: 60%

Section: Optical Characterization Of Surface Vibrationsmentioning

confidence: 99%

Measurement of evanescent wave properties of a bulk acoustic wave resonator [Letters]

Kokkonen

Meltaus

Pensala

et al. 2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…Low temperature lattice thermal expansion of trigonal LiNbO 3 is also obtained. The results are compared with those obtained by other workers [15][16][17][18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 88%

Higher Order Elastic Constants, Gruneisen Parameters and Lattice Thermal Expansion of Lithium Niobate

Philip

Menon

Indulekha

2006

Journal of Chemistry

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Abstract:The second and third-order elastic constants and pressure derivatives of second-order elastic constants of trigonal LiNbO 3 (lithium niobate) have been obtained using the deformation theory. The strain energy density estimated using finite strain elasticity is compared with the strain dependent lattice energy density obtained from the elastic continuum model approximation. The second-order elastic constants and the non-vanishing third-order elastic constants along with the pressure derivatives of trigonal LiNbO 3 are obtained in the present work. The second and third-order elastic constants are compared with available experimental values. The second-order elastic constant 11 C which corresponds to the elastic stiffness along the basal plane of the crystal is less than 33 C which corresponds to the elastic stiffness tensor component along the c-axis of the crystal. The pressure derivatives, dp C d ij / ′ obtained in the present work, indicate that trigonal LiNbO 3 is compressible. The higher order elastic constants are used to find the generalized Gruneisen parameters of the elastic waves propagating in different directions in LiNbO 3 . The Brugger gammas are evaluated and the low temperature limit of the Gruneisen gamma is obtained. The results are compared with available reported values.

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“…2, and the waveguide was fabricated by the same process. For the estimation of group velocity, we used the material constants of Kovacs [9].…”

Section: Focusing Idtmentioning

confidence: 99%

“…A possible reason is the difference between the material constants used in design and those of the actual substrate. Thus, we estimated the angular dependence of the phase velocity and the shift of the focal position for the available material constants, in particular, the data of Nakagawa [10,11], Kushibiki [13], Kovacs [9], and Warner [10,12]. The angular dependence of the phase velocity is shown in Fig.…”

Section: Focusing Idtmentioning

confidence: 99%

A low‐power droplet manipulator employing high‐frequency surface acoustic waves

Sasaki¹,

Tanaka²,

Omori³

et al. 2009

Elect Comm in Japan

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SUMMARYA droplet manipulator working with low driving power was developed by using the surface acoustic wave (SAW) technology. The manipulator was driven at a relatively high frequency of 350 MHz to increase the SAW power density. First, a single-phase unidirectional transducer (SPUDT) was designed. Because of its low insertion loss of 1.5 dB and high directivity of 10 dB, the SPUDT successfully conveyed a 100-nl water droplet with RF input power of 18 dBm (60 mW). Second, the SPUDT design was extended to a curved transducer to focus and launch the SAW energy into the narrow waveguide. Owing to the increased SAW power density, the required SAW power was reduced to 15 dBm (30 mW) for the 100-nl droplet manipulation. In addition, fabrication of liquid injectors was discussed for the formation of tiny droplets.

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Improved material constants for LiNbO/sub 3/ and LiTaO/sub 3/

Cited by 251 publications

References 10 publications

Measurement of evanescent wave properties of a bulk acoustic wave resonator [Letters]

Measurement of evanescent wave properties of a bulk acoustic wave resonator [Letters]

Higher Order Elastic Constants, Gruneisen Parameters and Lattice Thermal Expansion of Lithium Niobate

A low‐power droplet manipulator employing high‐frequency surface acoustic waves

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