Two-Photon Porphyrin Core Dendrimers for Optical Power Limiting

Abstract : This research is to establish novel nonlinear-absorbing materials with large intrinsic two-photon cross section for fast response optical power limiting in the photon wavelength range 700 - 900nm. We synthesize novel porphyrin core dendrimers, which combine the large 2PA efficiency of conjugated dendrites with the high efficiency of excited state absorption of the core tetrapyrrole. The goal of this project is to (a) establish structure property relationships for the novel class of two-photon assisted reverse saturable absorption materials and (b) optimize the chromophores for practical use, including high number density and solubility requirements. Our materials and results are transferred for further testing and evaluation at the Wright-Patterson AFB/MLPJ (Dr. A. Urbas).

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