The theory and experiment of solute migration caused by excited state absorptions |
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| Authors: | Jin Xiao Wang Yu-Xiao Shui Min Li Chang-Wei Yang Jun-Yi Zhang Xue-Ru Yang Kun Song Ying-Lin |
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| Affiliation: | Department of Physics, Soochow University, Soochow 215006, China; Department of Physics, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Nonsymmetrical transition from reverse-saturableabsorption (RSA) to saturable absorption (SA) caused by excitedstate absorption induced mass transport of the CuPcTs dissolved indimethyl sulfoxide is observed in an open aperture Z-scan experimentwith a 21-ps laser pulse. The nonsymmetrical transition from RSA to SAis ascribed neither to saturation of excited state absorption nor tothermal induced mass transport, the so-called Soret effect. In ourconsideration, strong nonlinear absorption causes the rapidaccumulation of the non-uniform kinetic energy of the solutemolecules. The non-uniform kinetic field in turn causes themigration of the solute molecules. Additionally, anenergy-gradient-induced mass transport theory is presented tointerpret the experimental results, and the theoretical calculationsare also taken to fit our experimental results. |
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| Keywords: | solute migration excited state absorption energy-gradient |
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