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Zinin, Pavel; Manghnani, Murli H.; Tkachev, S. V.; Askarpour, Vahid; Lefeuvre, O.; Every, A. G.

doi:10.1103/physrevb.60.2844

Cited by 32 publications

(12 citation statements)

References 23 publications

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“…The experimental observation of the surface and interface modes predicted here can be performed by means of Brillouin scattering experiments [24][25][26] and picosecond laser technique. 27 Because many new devices are based on layered structures, 28,29 it is important to understand and characterize propagation of waves in this kind of system.…”

Section: Discussionmentioning

confidence: 99%

Surface and interface shear horizontal acoustic waves in piezoelectric superlattices

Bousfia

Boudouti

Bria

et al. 2000

Journal of Applied Physics

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The propagation of acoustic waves of shear horizontal polarization in infinite and semi-infinite superlattices made of two piezoelectric media is studied within a Green's function method. Localized modes induced by a free surface of the superlattice or a superlattice/substrate interface are investigated theoretically. These modes appear as well-defined peaks of the total density of states inside the minigaps of the superlattice. The spatial localization of the different modes is studied by means of the local density of states. The surface of the superlattice and the superlattice/substrate interface are considered to be either metallized or nonmetallized. We show the possibility of the existence of interface modes, which are without analogue in the case of the interface between two homogeneous media ͑the so-called Maerfeld-Tournois modes͒. We also generalize to piezoelectric superlattices a rule about the existence and number of surface states, namely when one considers two semi-infinite superlattices together obtained by the cleavage of an infinite superlattice, one always has as many localized surface modes as minigaps, for any value of the wave vector k ʈ ͑parallel to the interfaces͒. Specific applications of these results are given for CdS-ZnO superlattices with a free surface or in contact with a BeO substrate.

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Section: Discussionmentioning

confidence: 99%

Surface and interface shear horizontal acoustic waves in piezoelectric superlattices

Bousfia

Boudouti

Bria

et al. 2000

Journal of Applied Physics

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“…The non-splitting type of behaviour has been observed experimentally in an alumina film on aluminium by acoustic microscopy [16], in doped Cr coatings deposited on high speed steel [17], in a titanium film on steel by SBS [18], in diamond-like-films (DCL) [19]. Splitting type of behavior has been observed recently for Si 3 N 4 films on GaAs [9]. Green's function simulations demonstrate that the effect of the thin hexagonal boron nitride (hBN) interlayer located between cBN film and Si substrate on the velocity of the surface acoustic wave (SAW) does not exceed 2% for a thin (16 nm) film and is negligible for cBN films thicker than 100 nm.…”

Section: Resultsmentioning

confidence: 93%

“…This peak is associated with leaky or pseudo SAW (PSAW) [15]. As θ or kh increase, the PSAM is transferred into leaky interface wave [9,15]. In the same spectral region, another broad peak appears, which with increasing θ becomes narrower, as the associated mode tends towards the Rayleigh mode of cBN.…”

Section: Resultsmentioning

confidence: 95%

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<title>Elastic properties of cBN films by surface Brillouin scattering</title>

Zinin

Manghnani

Zhang

et al. 2002

Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems

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Surface Brillouin scattering (SBS) has been used to determine the elastic properties of thin hard submicron films cBN deposited on silicon. In case of cBN films, only the Rayleigh mode can be clearly identified in the Brillouin spectra. The elastic properties of the films have been determined by fitting experimental data to theoretical dispersion curves. A Green's function method was used to predict Brillouin scattering spectra of the acoustic excitation at the free surface. Our results demonstrate that the effect of thin hBN interlayer located between cBN film and Si substrate on the velocity of surface acoustic wave (SAW) does not exceed 2% for thin (16 nm film) and is negligible for cBN films thicker than 100 nm. The elastic properties of the cBN films are not softer than those of bulk cBN.

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“…Brillouin scattering has proved able to measure the elastic properties of materials, exploiting either bulk acoustic waves [6] or Surface Brillouin Scattering (SBS), i.e. scattering by SAWs [7][8][9][10][11][12]. In particular in the case of layered structures, namely of a single isotropic layer on an anisotropic substrate, the elastic constants of films have been measured, for film thicknesses ranging from hundreds to tens of nanometers [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Elastic Constants of Nanometer Thick Diamond-like Carbon Films

et al. 2001

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Carbon films of thickness down to 2 nanometers are necessary to achieve a storage density of 100 Gbit/in 2 in magnetic hard disks. Reliable methods to measure the properties of these ultrathin films still have to be developed. We show for the first time that combining Surface Brillouin Scattering (SBS) and X-ray reflectivity measurements the elastic constants of such films can be obtained. Tetrahedral amorphous carbon films were deposited on silicon, by an S bend filtered cathodic vacuum arc, which provides a continuous coverage on large areas free of macroparticles. Films of thickness down to 2 nm and density of-3 g/cm 3 were produced and characterized. The dispersion relations of surface acoustic waves are measured by SBS for films of different thickness and for the bare substrate. Waves can be described by a continuum elastic model. Fitting of the dispersion relations, computed for given film properties, to the measured dispersion relations allows the derivation of the elastic constants. For a 8 nm thick film we find a Young's modulus E around 400 GPa, with a shear modulus G lying in the 130 -210 GPa interval. For a 4.5 nm thick film, E is around 240 GPa, with G lying in the 70 -130 GPa interval. Results for even thinner films become highly sensitive to the precision of the substrate properties, and indicate that the above values are lower bounds. We thus show that we can grow and characterize nanometer size tetrahedral amorphous carbon films, which maintain their density and mechanical properties down to the nm range.

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Brillouin spectroscopy of surface modes in thin-filmSi3N4on GaAs

Cited by 32 publications

References 23 publications

Surface and interface shear horizontal acoustic waves in piezoelectric superlattices

Surface and interface shear horizontal acoustic waves in piezoelectric superlattices

<title>Elastic properties of cBN films by surface Brillouin scattering</title>

Elastic Constants of Nanometer Thick Diamond-like Carbon Films

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