Observing backfolded and unfolded acoustic phonons by broadband optical light scattering.
作者： L. Maerten , A. Bojahr , M. Bargheer
DOI: 10.1016/J.ULTRAS.2014.08.023
关键词: Light scattering 、 Brillouin zone 、 Condensed matter physics 、 Dispersion relation 、 Physics 、 Brillouin scattering 、 Phonon 、 Optics 、 Excitation 、 Wave vector 、 Pulse (physics)
摘要: We use broadband time domain Brillouin scattering to observe coherently generated phonon modes in bulk and nanolayered samples. transform the measured transients into a frequency-wavevector diagram compare resulting dispersion relations calculations. The detected oscillation amplitude depends on occupation of induced by pump pulse. For samples with an appropriately large period, whole wavevector range zone becomes observable optical light scattering. backfolded vanish, when excitation has passed nanolayers propagates through substrate underneath.
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