Transition Metal Complex/Polymer Systems as Optical Limiting Materials.

摘要

This project was directed toward the generation of long wavelength visible optical limiting materials that respond via a combination of reverse saturable absorption and two-photon absorption processes. The particular wavelength range we have focused on initially is the 600- 900 nm range, covering frequencies of regeneratively amplified Ti:sapphire lasers. The chromophores all have two relatively independent chromophoric systems as a part of their structure. One system is optimized to exhibit one or two photon absorption in the long wavelength visible region and the other, accessed by population of the first, allows optimization of the transient absorption of light that will provide the optical limiting effect. This report discusses our work in three areas: (a) the design and synthesis of ligands and metal complex systems that approach optimization of the two chromophoric components, (b) photophysical characterization and evaluation of the figures of merit for the chromophores and (c) the study of vibrational energy dissipation in model systems excited in the infrared and involving relaxation assisted two-dimensional infrared spectroscopy.