Figure 3 | Scientific Reports

Figure 3

From: Coherent Phonon Transport Measurement and Controlled Acoustic Excitations Using Tunable Acoustic Phonon Source in GHz-sub THz Range with Variable Bandwidth

Figure 3

Demonstration of narrowband acoustic phonon source with bandwidth tunability. (a) Cross-correlation signals of the intensity-modulated optical pump pulse with different numbers of cycle of oscillation, and a 100 fs optical pulse. (b) The differential transient reflectivity signals induced by the narrowband acoustic phonons after optical excitation. (c) The Fourier spectra of the corresponding transient reflectivity signals in (b).

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