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Thermal conductivity of GaAs nanowires studied by micro-Raman spectroscopy combined with laser heating
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Image of FIG. 1.
FIG. 1.

(a) Scanning electron micrograph of the typical sample configuration: the NW is freely suspended between two gold pads. (b) Spatially resolved Raman measurement on a single NW. The maxima of the TO peaks are highlighted by white dots. The dashed lines visualize the gold pad edges. Darker shades correspond to higher intensity (a.u.).

Image of FIG. 2.
FIG. 2.

Fraction of the incident laser power absorbed inside the NW for different substrate configurations. The peaks are attributed to the TM modes shown on the right hand side.

Image of FIG. 3.
FIG. 3.

Example of parabolic temperature profiles obtained for homogeneous NWs. Symbols indicate experimental data points; solid lines are parabolic fits. (diameter: 160 nm).

Image of FIG. 4.
FIG. 4.

for a single 170 nm NW measured at different powers. The data point indicated by the empty circle was measured at last. The temperatures indicate the . We observe irreversible changes with increasing laser power.

Image of FIG. 5.
FIG. 5.

(a) Measurement performed on a NW with inhomogeneous diameter. (b) Model used for the estimation of .


Generic image for table
Table I.

Values of calculated from the profiles in Fig. 3.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal conductivity of GaAs nanowires studied by micro-Raman spectroscopy combined with laser heating