摘要
主要采用吸收光谱、荧光光谱和皮秒Z-扫描等实验方法研究了三种不同取代基的卟啉化合物5,10,15,20-四对羟基苯基卟啉[T(4-HP)P]、5,10,15,20-四对酯基苯基卟啉[T(4-EP)P]和5,10,15,20-四对溴苯基卟啉[T(4-BrP)P]的光学及非线性光学性质,并从离域电子共轭结构理论和共振、非共振增强理论进行了分析。结果表明,强给电子基团取代的T(4-HP)P的吸收和荧光发射带比弱给电子基团取代的T(4-EP)P及吸电子基团取代的T(4-BrP)P有明显红移;三种样品均具有正的三阶非线性极化率χ(3),强的给电子能力和共振增强使得T(4-HP)P的三阶极化率比T(4-BrP)P增强了近两个量级,并在532 nm光激发时,χ(3)具有最大值6.81×10-10esu。
The linear and nonlinear optical properties of three porphyrin compounds with different substituents, meso-tetra （p-hydroxyphenyl） porphyrin [T（4-HP）P], meso-tetra （p-esterphenyl） porphyrin [-T（4-EP）P] and mesotetra （p-bromophenyl） porphyrin [T（4-BrP）P] have been investigated by using absorption spectroscopy, fluorescence spectroscopy and picosecond Z-scan technique. The optical properties of the three compounds were discussed on the basis of π-electron conjugated structures and resonant/non-resonant enhancement. The experimental results showed that the absorption and fluorescent emission bands of T（4-HP）P substituted by stronger donating electron group shift towards lower photon energy, in comparison of T （4-EP）P substituted by weaker donating electron group and T（4-BrP）P substituted by accepting electron group. All the three compounds had positive third-order nonlinear susceptibilities χ^（3）. With the resonant excitation at 532 nm, the third-order nonlinear susceptibility χ^（3） of T（4-HP） P showed a maximum of 6.81×10^10esu, which is two orders of magnitude larger than that of T（4-BrP）P.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2008年第1期132-137,共6页
Acta Optica Sinica
基金
国家自然科学基金(60476001)
河南大学自然科学基金(05ZDZR008)重点资助课题
关键词
光学材料
卟啉化合物
三阶非线性极化率
Z-扫描
非线性吸收
共振增强
optical materials
porphyrin compound
third-order nonlinear polarizability
Z-scan technique
nonlinear absorption
resonant enhancement
