Surface Brillouin scattering in Titanium Carbide films

Sumanya, C.; Comins, J. D.; Every, A. G.

doi:10.1016/j.wavemoti.2016.08.011

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…At lower scattering angles, the Rayleigh peaks merge into the central elastic peak, and we observe Sezawa peaks around ±11.5 GHz. Sezawa peaks are typical of soft films on hard substrates, 55 as is our case for Ca 3 Co 4 O 9 on sapphire. The invariance of the surface Rayleigh velocity with k ‖ d ( Fig.…”

Section: Resultsmentioning

confidence: 59%

“…At lower scattering angles, the Rayleigh peaks merge into the central elastic peak, and we observe Sezawa peaks around AE11.5 GHz. Sezawa peaks are typical of so lms on hard substrates,55 as is our case for Ca 3 Co 4 O 9 on sapphire. The invariance of the surface Rayleigh velocity with kkd (Fig.10b) within experimental uncertainties is indicative of the elastic properties of the Ca 3 Co 4 O 9 lm with negligible inuence of the sapphire substrate.…”

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confidence: 57%

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Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

et al. 2022

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Section: Resultsmentioning

confidence: 59%

mentioning

confidence: 57%

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

et al. 2022

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“…Therefore, they are at the origin of the positive impact of boundary scattering, which is the basis of waveguiding and of the surface and interface waves . In plates and layered materials, for example, this leads to multiple nonlinear spatial dispersive phonon modes, which propagate in‐plane, where the plate or layer thickness acts as the tuning parameter . Further control of the phonon dispersion relation is attained by a periodic modulation of the elastic properties in PnCs .…”

Section: Introductionmentioning

confidence: 99%

“…[4] In plates and layered materials, for example, this leads to multiple nonlinear spatial dispersive phonon modes, which propagate in-plane, where the plate or layer thickness acts as the tuning parameter. [5][6][7][8] Further control of the phonon dispersion relation is attained by a periodic modulation of the elastic properties in PnCs. [9,10] The interest in PnCs has often been related with the occurrence of frequency bandgaps, which appear as a consequence of Bragg scattering when the phonon wavelength has a definite relation to the periodicity, but also to the resulting modification of the dispersion relation.…”

Section: Introductionmentioning

confidence: 99%

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Sledzinska

Graczykowski

Maire

et al. 2019

Adv Funct Materials

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The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. Phononics exploits the present state of the art in nanofabrication to tailor dispersion relations in the range of GHz for the control of elastic waves/phonons propagation with applications toward new information technology concepts with phonons as state variable. Moreover, phonons provide an adaptable approach for supporting a coherent coupling between different state variables, and the development of nanoscale optomechanical systems during the last decade attests this prospect. The most extended approach to manipulate the phonon dispersion relation is introducing an artificial periodic modulation of the elastic properties, which is referred to as phononic crystal (PnC). Herein, the focus is on the recent experimental achievements in the fabrication and application of 2D PnCs enabling the modification of the dispersion relation of surface and membrane modes, and presenting phononic bandgaps, waveguiding, and confinement in the hypersonic regime. Furthermore, these artificial materials offer the potential of modifying and controlling the heat flow to enable new schemes in thermal management.

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“…A wide range of techniques is available to investigate the elastic properties of coatings; namely, nanoindentation [2,3] and various acoustic based techniques [4], including Brillouin spectroscopy [5,6,7,8], while little is known about the CTE of films. The standard techniques adopted to measure the CTE of bulk materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

Coefficient of thermal expansion of nanostructured tungsten based coatings assessed by substrate curvature method

et al. 2018

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The in plane coefficient of thermal expansion (CTE) and the residual stress of nanostructured W based coatings are extensively investigated. The CTE and the residual stresses are derived by means of an optimized ad-hoc developed experimental setup based on the detection of the substrate curvature by a laser system. The nanostructured coatings are deposited by Pulsed Laser Deposition. Thanks to its versatility, nanocrystalline W metallic coatings, ultra-nano-crystalline pure W and W-Tantalum coatings and amorphous-like W coatings are obtained. The correlation between the nanostructure, the residual stress and the CTE of the coatings are thus elucidated. We find that all the samples show a compressive state of stress that decreases as the structure goes from columnar nanocrystalline to amorphous-like. The CTE of all the coatings is higher than the one of the corresponding bulk W form. In particular, as the grain size shrinks, the CTE increases from 5

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Surface Brillouin scattering in Titanium Carbide films

Cited by 9 publications

References 23 publications

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Coefficient of thermal expansion of nanostructured tungsten based coatings assessed by substrate curvature method

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Surface Brillouin scattering in Titanium Carbide films

Cited by 9 publications

References 23 publications

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)2/Co3O4 multilayers

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)2/Co3O4 multilayers

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Coefficient of thermal expansion of nanostructured tungsten based coatings assessed by substrate curvature method

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Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers