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Pump-probe surface reflectance measurement of 40-period (100) SL. The inset shows the coherent LA phonon oscillations at after subtraction of the background.
Coherent phonon oscillations in surface reflectance measurements of 40-period SLs grown on (311) and (211) substrates. In both cases the pump light was polarized parallel to
Fourier power spectrum of coherent phonon oscillations in (311) SL for pump light polarized parallel to and . Also shown is the folded phonon dispersion for the QT and TA modes.
(a) On- and off- resonance bolometer signals for (311) sample, showing the time of arrival of the longitudinal (L) and transverse (T) phonon pulses. The lower trace (solid line) shows the difference between the on- and off-resonance signals (multiplied by 4). (b) TA intensity (after subtraction of the off-resonance signal) as a function of the pump photon energy. For this SL the fundamental gap is at .
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