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Nonlinear Optical Properties of D-π-A-π-D Type Oligomers with Different Conjugation Length
Tian-hao Huang1,2, Ying-hui Wang2, Tian-ning Xu*1, Feng-ying Yu1, Han-zhuang Zhang2, Yu-ran Wang3
1.Department of Science, Zhijiang College of Zhejiang University of Technology, Hangzhou 310024, China;2.Femtosecond Laboratory, College of Physics, Jilin University, Changchun 130012, China;3.North China University of Science and Technology, Tangshan 063000, China
Abstract:
The conjugation length-dependent nonlinear optical properties of fluorenone-based linear conjugated oligomers have been investigated by experimental and theoretical methods. In-frared spectra and the steady-state absorption spectra show that the increase of conjugated unit could enhance the stretching vibration peaks of C=C and lead to a red-shift of the absorption peaks. Meanwhile, the two-photon fluorescence (TPF) intensity is gradually en-hanced with the increase of excitation energy, and the TPF effciency is obviously higher after the introduction of fluorene-ethylene units. The sum-over-states approach was used to model the two-photon absorption (TPA) cross-sections of oligomers, and the theoretical values agree well with the experimental data obtained from the femtosecond open-aperture z-scan technique. The results exhibit that the extension of conjugated system indeed plays a role in the improvement of TPA behavior of oligomers.
Key words:  Linear conjugated oligomer, Two-photo absorption, Sum-over-states
FundProject:
具有不同共轭长度的D-π-A-π-D型低聚物的非线性光学性质
黄田浩1,2, 王英惠2, 徐天宁*1, 虞凤英1, 张汉壮2, 王雨冉3
1.浙江工业大学之江学院理学系,杭州310024;2.吉林大学物理学院飞秒激光实验室,长春130012;3.华北理工大学,唐山063000
摘要:
通过实验和理论方法研究了共轭长度依赖的芴酮基线型共轭低聚物的非线性光学性质. 首先,红外光谱和稳态吸收光谱测量表明:共轭单元的增加会增强碳-碳双键伸缩振动峰,并导致稳态吸收峰的红移. 同时,双光子荧光强度会随着激发光能量的增长而逐渐增强,在引入芴-亚乙烯基单元后,双光子荧光效率有了明显的升高. 进而利用完全态求和方法模拟低聚物的双光子吸收截面,得到的理论值与通过飞秒开孔Z-扫描技术获得的实验结果吻合得较好. 研究结果表明共轭体系的延展确实会对低聚物双光子吸收特性的提高起到重要的作用.
关键词:  线型共轭低聚物,双光子吸收,完全态求和
DOI:10.1063/1674-0068/28/cjcp1504065
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