Molecular orientation by two-photon absorption

摘要

We demonstrate that two-photon induced molecular orientation of diarylethene (DE) in thin films of poly-methyl-methacrylate (PMMA) and multi-photon induced anisotropic bleaching of disperse red one (DR1). We confirmed that two-photon absorption was induced in DE by measuring the quadratic dependence of isomerization rate on excitation light power, and we observed two-photon photo-orientation of DE in dichroic absorbance. Disperse red one (DR1) was orientationally bleached in PMMA by polarized multi-photon excitation. Anisotropic refractive index changes result from the nonlinear photobleaching of DR1 was detected by a polarization confocal microscope, and bit-oriented data storage was demonstrated.