Insulating layer on a known substrate or a stack of known layers, covered with a conducting layer.
Configuration under study. Left: real configuration (not to scale). Right: Equivalent configuration at high frequencies ( 100 kHz).
Shifted amplitude and phase of the thermoreflectance signal versus radial coordinate r, at different modulation frequencies. For clarity, the curves have been shifted along the ordinate axis (upper panel: 2 muliplier factor between successive curves. Lower panel: 5° shift between adjacent curves). From upper curve to lower curve: 1, 10, 50, 100, 200, 400, 1000 kHz. Full circles are for experimental points. Full lines are fits.
Determination of the slopes absolute values a and b, at different frequencies. Upper panel: versus r where A is the magnitude of the thermoreflectance signal. Lower panel: phase of the thermoreflectance signal versus r. Full circles stand for experimental points. Full lines are fits. From upper curve to lower curve: 100, 200, 400, 1000 kHz.
Upper panel: fit of versus . Lower panel: fit of versus ω. and q are the slope of the fitting line. See Eqs. (7) and (8) .
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