Fig. 1 | Nature Communications

Fig. 1

From: Imaging gigahertz zero-group-velocity Lamb waves

Fig. 1

Sample, surface particle velocity variation, and acoustic frequency spectrum. a Schematic diagram of the sample. DM: dichroic mirror, OL: objective lens. The double-ended arrows represent the probe-beam 2D scanning realized by moving mirrors and a confocal lens pair (see Methods). b Out-of-plane surface particle velocity measured for co-focused pump and probe beams. c Zoom-in of the ZGV Lamb mode amplitude temporal evolution and fit \(\propto 1/\sqrt t\). d Frequency spectrum obtained after temporal Fourier transform. Arrows indicate the two modes imaged in Fig. 2. e Evolution of the normalized amplitude in the frequency window 1.688 ≤ f ≤ 1.692 GHz. The solid line is a fit to the experimental data in the form of the square root of a Lorentzian. The dashed line represents \(1/\sqrt 2\) (i.e., −3 dB) of the maximum amplitude of the fit

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