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. 2021 Jun 1;12:3267. doi: 10.1038/s41467-021-23359-7

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Fig. 3 — a Time-dependent reflectivity for a h-BN (44 nm)/MoS₂ (8.7 nm/14 L) suspended film. b FFT spectrum of the signal shown in a. The red tick marks along the bottom of the plot show positions of the bilayer overtones as predicted by FEM eigenfrequency analysis. The peaks are numerically labeled from lowest to highest frequency. (inset) Extracted lifetimes for h-BN (τ_hBN) versus frequency for peaks in b (see Supplementary Note 4 for details of the extraction method). c Spatial configuration of the normalized ε_ZZ strain for three different modes (labeled) in the h-BN/MoS₂ heterostructure (eigenfrequency FEM analysis, 1D model). d Snapshots of the ε_ZZ strain distribution generated by optically-excited MoS₂ are shown across the thickness of the bilayer at early delay times (for details of time-domain axisymmetric FEM analysis, see Supplementary Note 3).