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The experimental setup: An inverted microscope focuses the light through the glass substrate into the organic layer. The SNOM accesses the layer from the top. For scanning, the sample is moved using a piezo controlled XYZ translator.
Time profile of transient absorbtion of the probe laser at 650 nm, at different pump (520 nm) intensities at the maximum of the focal spot (a), and at different points in the focal spot area (b).
SNOM image of a 160 nm film of PTCDA, displaying transient absorption of the probe pulse at 650 nm, 200 fs after the pump excitation at 520 nm (a), and AFM topography (b).
SNOM images of a 160 nm film of PTCDA displaying absorption of the probe pulse at 650 nm, 200 fs after the pump excitation at 520 nm (a), and without pump excitation (b). The images were taken without accumulation of laser pulses (single shot data points).
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