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Probing elastic properties of nanowire-based structures

Abstract : We report the analysis of elastic properties of a composite medium consisting of GaN nanowires embedded into a dielectric matrix, which constitutes the active material of nanowire-based piezogenerators. A non-invasive technique, Transient Grating Method, is used to generate and analyze the propagation of acoustic waves in the frequency range from a few tens of MHz to several GHz. The wave propagation is simulated using the time-efficient computer model based on the explicit integral and asymptotic representations for laser-generated surface acoustic waves in layered anisotropic waveguides. Effective parameters of the multilayered model are obtained via the minimization of the discrepancy between the measured and calculated wave characteristics. A comparison with a reference composed of a dielectric matrix without nanowires shows that the mechanical behavior is strongly influenced by the presence of the nanostructures.
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Submitted on : Tuesday, November 6, 2018 - 3:47:32 PM
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L. Lu, E. Charron, E. Glushkov, N. Glushkova, B. Bonello, et al.. Probing elastic properties of nanowire-based structures. Applied Physics Letters, American Institute of Physics, 2018, 113 (16), pp.161903 (2018). ⟨10.1063/1.5045665⟩. ⟨hal-01913851⟩

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