【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。更多还原

【Abstract】 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 meso-tetra(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 6.81×10-10 esu,which is two orders of magnitude larger than that of T(4-BrP)P.更多还原