Excited-State Absorption and Sign Tuning of Nonlinear Refraction in Porphyrin Derivatives

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• 作者：Li Jiang ; Tonggang Jiu ; Yuliang Li ; Yunbo Li ; Junyi Yang ; Junbo Li ; Cuihong Li ; Huibiao Liu ; Yinglin Song
• 刊名：Journal of Physical Chemistry B
• 出版年：2008
• 出版时间：January 24, 2008
• 年：2008
• 卷：112
• 期：3
• 页码：756 - 759
• 全文大小：107K
• 年卷期：v.112,no.3(January 24, 2008)
• ISSN：1520-5207

文摘

The nonlinear absorptions and nonlinear refractions of free-base porphyrin (P2) and Zn-porphyrin (ZnP2)were studied using the Z-scan technique at 532 nm with different pulse durations. Both P2 and ZnP2 exhibitreverse saturated absorption attributed to excited-state absorption. The coordination of P2 by Zn ion can alterthe nonlinear refraction sign from negative to positive at 4 ns pulse. The results indicate that the sign ofself-lensing can be tuned by the coordination of Zn in the porphyrin derivatives. In the case of longer pulseduration, the thermal effect was enhanced to dominate the nonlinear refraction sign, leading to the negativenonlinear refraction repeated appearance.