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Open AccessArticle

Elastic Characterization of Transparent and Opaque Films, Multilayers and Acoustic Resonators by Surface Brillouin Scattering: A Review

Dipartimento di Fisica e Geologia, Università di Perugia, 06123 Perugia, Italy
Appl. Sci. 2018, 8(1), 124; https://doi.org/10.3390/app8010124
Received: 17 December 2017 / Revised: 1 January 2018 / Accepted: 5 January 2018 / Published: 16 January 2018
(This article belongs to the Special Issue Brillouin Scattering and Optomechanics)
There is currently a renewed interest in the development of experimental methods to achieve the elastic characterization of thin films, multilayers and acoustic resonators operating in the GHz range of frequencies. The potentialities of surface Brillouin light scattering (surf-BLS) for this aim are reviewed in this paper, addressing the various situations that may occur for the different types of structures. In particular, the experimental methodology and the amount of information that can be obtained depending on the transparency or opacity of the film material, as well as on the ratio between the film thickness and the light wavelength, are discussed. A generalization to the case of multilayered samples is also provided, together with an outlook on the capability of the recently developed micro-focused scanning version of the surf-BLS technique, which opens new opportunities for the imaging of the spatial profile of the acoustic field in acoustic resonators and in artificially patterned metamaterials, such as phononic crystals. View Full-Text
Keywords: acousto-optics at the micro- and nanoscale; photon scattering by phonons; elastic constants of films and multilayers acousto-optics at the micro- and nanoscale; photon scattering by phonons; elastic constants of films and multilayers
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Carlotti, G. Elastic Characterization of Transparent and Opaque Films, Multilayers and Acoustic Resonators by Surface Brillouin Scattering: A Review. Appl. Sci. 2018, 8, 124.

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