Near-field scanning optical microscopy (NSOM) has been used to investigate spatially localized energy transfer properties of self-assembled
polyelectrolyte films consisting of poly(p-phenylene vinylene) (PPV) and poly(allylamine hydrochloride) (PAH) doped with Texas Red dye
(TR-PAH). Local differences in energy transfer efficiency highlight the unique multilayer interpenetration properties of thin films constructed
using the layer-by-layer (LbL) electrostatic self-assembly technique, as well as the importance of localized probes, to discern local variation
that would not be observed using spatially averaged measurements.
We investigated the diffractive focusing properties of ͑111͒ GaAs linear Bragg-Fresnel lenses ͑BFLs͒ developed for hard x-ray microscopy and microdiffraction of complex materials in confined geometries. We demonstrated that the use of GaAs yields significant processing advantages due to the reduced zone depth. Focal plane diffraction patterns of linear BFLs measured at the advanced photon source using 8-40 keV x rays were compared to a simple model based on Kirchhoff-Fresnel diffraction theory. Good agreement was obtained between experimental data and model calculations using only zones within an effective aperture defined by the transverse coherence of the source.
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