Building symmetric two-dimensional two-photon materials
Building symmetric two-dimensional two-photon materials
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DOI：
10.1021/ja062709x
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发表时间：
2006-11-01
影响因子：
15
通讯作者：
Goodson, Theodore, III
中科院分区：
文献类型：
--
作者：
Bhaskar, Ajit;Guda, Ramakrishna;Goodson, Theodore, III
二维多环碳网络是重要的分子，在光电子器件和非线性光学中可能有应用。采用基本的积木式方法和可变对称性，对一系列轮烯的双光子吸收截面进行了研究。增强的TPA横截面已被观察到的建筑块的数量和对称顺序的增加。基态跃迁偶极矩和发色团密度的评估不足以解释所观察到的增强。飞秒瞬态吸收测量的激发态跃迁偶极矩的估计是能够成功地预测所观察到的趋势，在TPA截面。已经观察到，分子的对称性通过增加激发态跃迁偶极矩在增强TPA截面中起着至关重要的作用。
Two-dimensional multi-annulenic carbon networks are important molecules with possible applications in optoelectronic devices and nonlinear optics. Investigations of two-photon absorption (TPA) cross sections have been carried out in a series of annulenes with a basic building block approach and variable symmetries. Enhancement of the TPA cross section has been observed with an increase in number of building blocks and order of symmetry. Evaluations of the ground-state transition dipole moment and chromophore density are not sufficient to explain the observed enhancement. Estimates of excited-state transition dipole moments made by femtosecond transient absorption measurements are able to successfully predict the observed trend in TPA cross section. It has been observed that the symmetry of the molecule plays a vital role in enhancing the TPA cross section by virtue of increasing the excited-state transition dipole moment.