Elastic Evaluation of Non-transparent Materials

Surface Acoustic Waves (SAWs) - speed of sound of SAWs (Rayleigh, Sezawa, Love, Lamb, and pseudo-SAWs) of metals, semiconductors, or metal-coated transparent solids as a function of propagation angle (angular anisotropy) and temperature (from -190°C to 250°C). Furthermore, based on BLS data, Young modulus and elastic tensor can be determined.

Figure: Schematic illustration of BLS backscattering geometry and the deformations corresponding to Rayleigh surface wave (RSW), longitudinal (L), and transverse waves (T1 and T2) bulk acoustic waves (BAWs). Symbols ki, ks, q, and ​Q denote incident light, scattered light, surface acoustic, and bulk acoustic wave vectors, respectively, while θ is the incident angle. b, c) Experimental and calculated BLS spectra for bulk MoSe2 obtained at θ = 45° for p-p polarization (b) and s-p polarization (c). HFPSAW denotes high-frequency pseudo-surface acoustic waves, while the red arrow represents the L BAW threshold. d) The measured dispersion relation for observed modes (circles) and their fitting (solid lines) for the bulk MoSe2.
References:

Thickness-Dependent Elastic Softening of Few-Layer Free-Standing MoSe2, V. Babacic et al. Advanced Materials 33 (23), 2008614 (2021),
Surface acoustic waves and elastic constants of Cu14%Al4%Ni shape memory alloys studied by Brillouin light scattering, B. Graczykowski et al. J. Phys. D: Appl. Phys. 44 455307 (2011).

Ways to reach us