超短脉冲
超快激光光谱学
共轭体系
瞬态(计算机编程)
宽带
非线性系统
动力学(音乐)
吸收(声学)
化学
光化学
物理
激光器
计算机科学
光学
有机化学
量子力学
声学
聚合物
操作系统
作者
Lu Chen,Xingzhi Wu,Zhongguo Li,Ruipeng Niu,Wenfa Zhou,Kun Liu,Yingfei Sun,Zhangyang Shao,Junyi Yang,Song Ye
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:12 (14): 8624-8631
被引量:5
摘要
The ultrafast nonlinear optical response of two 1,3-indandione derivatives (INB3 and INT3) was systematically investigated by the femtosecond Z-scan and pump-probe technique at multiple visible and near infrared wavelengths. Both compounds show strong broadband nonlinear absorption (NLA) and different wavelength-dependent two-photon absorption (TPA) characteristics in the range of 650-1100 nm. The TPA cross section of trithiophene-based compound INT3 was found to be larger than that of triphenylamine-based compound INB3 in the red region (650-800 nm), which is attributed to its longer π-conjugated structure and better molecular planarity. Interestingly, the effective NLA of INB3 was found to be larger than INT3 in the NIR region (800-1100 nm), which is related to the excited state absorption (ESA) induced by TPA. The ultrafast dynamics of both compounds were investigated by femtosecond transient absorption spectroscopy, which revealed a broadband ESA including several relaxation processes. This work extends nonlinear optical research on indandione derivatives, and the results suggest that these derivatives are promising candidates for optical limiting applications.
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