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Generation and detection of terahertz coherent transverse-polarized acoustic phonons by ultrafast optical excitation of superlattices
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10.1063/1.2191877
/content/aip/journal/apl/88/13/10.1063/1.2191877
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/13/10.1063/1.2191877
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Pump-probe surface reflectance measurement of 40-period (100) SL. The inset shows the coherent LA phonon oscillations at after subtraction of the background.

Image of FIG. 2.
FIG. 2.

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

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

(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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/content/aip/journal/apl/88/13/10.1063/1.2191877
2006-03-31
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Generation and detection of terahertz coherent transverse-polarized acoustic phonons by ultrafast optical excitation of GaAs∕AlAs superlattices
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/13/10.1063/1.2191877
10.1063/1.2191877
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