Finite chain-length effect on nonlinear optical response in polysilane as investigated by electroabsorption spectroscopy.
Finite chain-length effect on nonlinear optical response in polysilane as investigated by electroabsorption spectroscopy.
复制标题
通过电吸收光谱研究有限链长对聚硅烷非线性光学响应的影响。
DOI：
10.1103/physrevb.54.r14254
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Tokura
中科院分区：
文献类型：
--
作者：
Kishida;Tachibana;Sakurai;Matsumoto;Tokura
我们研究了硅低聚物 Si 10 (CH 3) 22 薄膜的电吸收光谱，硅低聚物 Si 10 (CH 3) 22 是准一维半导体聚硅烷的有限链类似物。所获得的光谱可以通过四能级模型很好地再现，其中单光子禁止态位于两个单光子允许态之间。通过与聚硅烷的光谱比较，发现激发态之间的跃迁偶极矩随着链长的减小而显着减小。这可以归因于激发态的限制。© 1996 美国物理学会。
We have investigated the electroabsorption spectrum for a thin film of the silicon oligomer Si 10 (CH 3) 22, a finite-chain analog of quasi-one-dimensional semiconductor polysilanes. The obtained spectrum can be well reproduced by a four-level model in which a one-photon-forbidden state is located between two one-photon-allowed states. By comparison with the spectra of polysilanes, it was found that the transition dipole moment between the excited states decreases significantly with a decrease of chain length. This can be ascribed to the confinement of the excited states.© 1996 The American Physical Society.