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Detecting optically synthesized quasi-monochromatic sub-terahertz phonon wavepackets by ultrafast x-ray diffraction
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10.1063/1.3688492
/content/aip/journal/apl/100/9/10.1063/1.3688492
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/9/10.1063/1.3688492
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic representation of coherent XRD from a reciprocal lattice vector G (solid lines) and from an additional phonon of wavevector Q (dashed lines). The same process is possible for G and Q being antiparallel. (b) Schematic of the experiment. Each laser pulse launches a bipolar strain wave into the substrate (dashed line) resulting in a phonon wavepacket with central wavevector Q (dashed and solid line).

Image of FIG. 2.
FIG. 2.

(Color online) (a) Experimental rocking curves (measured piecewise) of the high-angle side of the STO substrate peak before (open black diamonds) and 130 ps after (solid red bullets) excitation by a pulse train with 7.2 ps pulse separation. Inset: static rocking curve measured with a high-resolution x-ray photodiode. The arrow indicates the shift of the SRO peak due to the photoinduced thermal expansion. (b) Simulations of the measured rocking curves without excitation (long-dashed black) and with excitation by a pulse train having a uniform (solid blue) and non-uniform (short-dashed red) pulse energy distribution. Inset: calculated strain pattern 130 ps after excitation with uniform (solid blue) and non-uniform (dashed red) pulse energy distribution.

Image of FIG. 3.
FIG. 3.

(Color online) Time evolution of the integrated intensity of the 1st order sideband in Fig. 2(a) (black bullets) and the corresponding fit (solid black line). For comparison, we also show the corresponding transient obtained from the simulation which disregards anharmonic interactions in Fig. 2(b) (dashed red line).

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/content/aip/journal/apl/100/9/10.1063/1.3688492
2012-02-27
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Detecting optically synthesized quasi-monochromatic sub-terahertz phonon wavepackets by ultrafast x-ray diffraction
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/9/10.1063/1.3688492
10.1063/1.3688492
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