Fig. 2: THz-phonon coupling dynamics probed by wavelength-resolved SHG spectroscopy under a narrowband probe light set-up. | Nature Communications

Fig. 2: THz-phonon coupling dynamics probed by wavelength-resolved SHG spectroscopy under a narrowband probe light set-up.

From: Coherent manipulation of second-harmonic generation via terahertz-field mediated phonon-polariton in zinc oxide

Fig. 2

a THz-induced SHG spectral modification: Solid curves show SHG intensities under THz excitation (0 ps delay) versus reference spectra without THz (color-shaded regions). Dashed vertical lines mark TO/LO phonon mode energies. b Time-delay-dependent SHG spectral evolution, revealing oscillatory features persisting beyond 60 ps. c Wavelength-selective SHG oscillation traces extracted from b, demonstrating pump-energy-dependent modulation depths. d Fourier transform analysis of oscillations SH in c, identifying dominant frequency components at 3.3, 3.6 and 3.9 THz, with shaded regions indicating ±0.15 THz spectral resolution.

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