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首页> 外文会议>International Conference on Self-Formation Theory and Applications; 20031126-20031128; Vilnius; LT >Cylindrical Aggregates of TDBC: Linear and Nonlinear Optical Properties Versus Morphology
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Cylindrical Aggregates of TDBC: Linear and Nonlinear Optical Properties Versus Morphology

机译：TDBC的圆柱形聚集体：线性和非线性光学性质与形态

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摘要

The linear and nonlinear optical properties of pure 3,3'-bis(3-carboxypropyl)-5,5',6,6'-tetrachloro-1, 1'-dioctylbenzimidacarbocyanine (C_8O_3) aggregates as well as of C_8O_3 aggregates in the presence of PVA are studied at room temperature. The obtained results reveal that absorption spectra of both aggregates are governed by four absorption bands. Three of these represent transitions having dipole moments oriented parallel to the axis of the aggregate and one oriented | perpendicular to it. The two lower energy parallel transitions are found to be weakly coupled which suggests that they represent two excitons located on different walls of the double-wall cylinder. In contrast, the lowest energy parallel transition and the transition having a transition dipole moment oriented perpendicular to the aggregate axis share the same ground state which reveals that they belong to the same exciton band. The manner of modification of the linear absorption with addition of PVA as well as the similarity of the pump-probe spectra of the two investigated aggregates suggests that this exciton band originates from the inner wall of the double-wall cylinder.
机译：纯3,3'-双（3-羧丙基）-5,5'，6,6'-四氯-1，1'-二辛基苯并咪唑基花菁（C_8O_3）聚集体以及C_8O_3聚集体的线性和非线性光学性质在室温下研究PVA的存在。所得结果表明两种聚集体的吸收光谱受四个吸收带支配。其中三个代表跃迁，其偶极矩平行于聚集体的轴，而一个垂直于它。发现两个较低能量的平行跃迁是弱耦合的，这表明它们代表位于双壁圆柱体不同壁上的两个激子。相反，最低能量的平行跃迁和具有垂直于聚集轴定向的跃迁偶极矩的跃迁具有相同的基态，这表明它们属于相同的激子带。添加PVA改变线性吸收的方式以及两个研究的聚集体的泵浦-探针光谱的相似性表明，该激子带起源于双壁圆柱体的内壁。

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