ELECTROMODULATION IN POLY(PARA-PHENYLENE)-TYPE LADDER POLYMER

We report studies on the electronic structure of the methyl substitute d poly(para-phenylene)-type ladder polymer (m-LPPP) using electromodul ation-techniques. Electric fields from 10 kV/cm up to a few hundred kV /cm were applied to the samples either parallel or perpendicular to th e incident light. The lineshape of the electroabsorption(EA)-spectra f ollows very closely the first derivative of the unperturbed absorption -spectra, Comparing EA-measurements with perpendicular and parallel fi eld geometry provides further insight into the nature of ordering of t he polymer-chains in films of different thickness.