Nonsymmetrical transition from reverse-saturable absorption （RSA） to saturable absorption （SA） caused by excited state absorption induced mass transport of the CuPcTs dissolved in dimethyl sulfoxide is observed in...Nonsymmetrical transition from reverse-saturable absorption （RSA） to saturable absorption （SA） caused by excited state absorption induced mass transport of the CuPcTs dissolved in dimethyl sulfoxide is observed in an open aperture Z-scan experiment with a 21-ps laser pulse. The nonsymmetrical transition from RSA to SA is ascribed neither to saturation of excited state absorption nor to thermal induced mass transport, the so-called Sorer effect. In our consideration, strong nonlinear absorption causes the rapid accumulation of the non-uniform kinetic energy of the solute molecules. The non-uniform kinetic field in turn causes the migration of the solute molecules. Additionally, an energy-gradient-induced mass transport theory is presented to interpret the experimental results, and the theoretical calculations are also taken to fit our experimental results.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 10104007)the Program for New Century Excellent Talents in University, China (Grant No. NCET-04-0333)the Excellent Youth Fund of Heilongjiang Province,China (Grant No. JC-04-04)
文摘Nonsymmetrical transition from reverse-saturable absorption （RSA） to saturable absorption （SA） caused by excited state absorption induced mass transport of the CuPcTs dissolved in dimethyl sulfoxide is observed in an open aperture Z-scan experiment with a 21-ps laser pulse. The nonsymmetrical transition from RSA to SA is ascribed neither to saturation of excited state absorption nor to thermal induced mass transport, the so-called Sorer effect. In our consideration, strong nonlinear absorption causes the rapid accumulation of the non-uniform kinetic energy of the solute molecules. The non-uniform kinetic field in turn causes the migration of the solute molecules. Additionally, an energy-gradient-induced mass transport theory is presented to interpret the experimental results, and the theoretical calculations are also taken to fit our experimental results.
