Communication: Near-field scanning optical microscopy (NSOM) has been
used to write and read images on a conjugated polymer film-such as tha
t in the Figure-with a resolution of similar to 0.1 mu m, clearly brea
king the diffraction limit. It is demonstrated that photo-oxidation pr
ocesses produce the contrast and that NSOM has the potential to contro
l the photochemistry of a conjugated polymer at the nanometer scale.