Abstract
We present experimental evidence of two-photon isomerization and orientation of a diarylethene derivative in films of poly-methyl-methacrylate. The changes of the linear absorption spectrum of the photochromic sample before and after infra-red, high power, pulsed, excitation are consistent with chromophores isomerization induced by two-photon absorption. The slopes of the real-time dynamics of two-photon isomerization showed the square law dependence on the pump light intensity. Two-photon molecular orientation was induced in the polymer samples by polarized infra-red excitation, and it was observed by dichroic absorption on the entire ultraviolet–visible spectrum of the isomers. Molecular reorientation by photoisomerization is inferred as a possible mechanism of the observed two-photon orientation.
Published Version
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