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Investigation of the intensity dependent transition from saturable absorption to reverse saturable absorption and ultrafast negative refraction in terthiophene-based chalcone derivatives
Optical Materials ( IF 3.9 ) Pub Date : 2021-05-29 , DOI: 10.1016/j.optmat.2021.111174
Xingzhi Wu , Yufang Shi , Yun Ju , Jidong Jia , Yu Fang , Yongqiang Chen , Quanying Wu , Yinglin Song

Two novel chalcone derivatives C12 & C13 are designed and synthesized. Terthiophene group is employed to provide the planar π-conjugated system in these molecules while the molecular planarity is tuned by the different substitutions at the terminal group. The ultrafast optical nonlinearities are investigated via transient absorption spectrum and Z-scan. It is generally assumed that a large planar π-system and strong intramolecular charge transfer can enhance the optical nonlinearities in organic nonlinear optical materials. However, the molecule with larger planar molecular structure displayed weaker nonlinear absorption due to the competition between saturable absorption and reverse saturable absorption. With DFT calculation, the structure-property relation and the enhancement of π-conjugated system on nonlinear absorption and refraction are discussed. The investigations and discussions may provide a different perspective of the nonlinear absorption and refraction in these organic molecules and the results also suggest that these chalcone derivatives are potential nonlinear refraction materials for all-optical applications.



中文翻译:

研究三噻吩基查尔酮衍生物从饱和吸收到反饱和吸收和超快负折射的强度依赖性转变

设计并合成了两种新型查耳酮衍生物 C12 和 C13。三噻吩基团用于在这些分子中提供平面 π 共轭系统,而分子平面性通过末端基团的不同取代进行调整。通过瞬态吸收光谱和 Z 扫描研究超快光学非线性。一般认为,大的平面 π 系统和强大的分子内电荷转移可以增强有机非线性光学材料的光学非线性。然而,由于可饱和吸收和反饱和吸收之间的竞争,具有较大平面分子结构的分子表现出较弱的非线性吸收。通过 DFT 计算,讨论了π共轭体系对非线性吸收和折射的结构性质关系和增强作用。研究和讨论可能为这些有机分子中的非线性吸收和折射提供不同的视角,结果还表明这些查耳酮衍生物是全光学应用的潜在非线性折射材料。

更新日期:2021-05-31
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