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18 December 2002 Influence of axial substitution on the optical limiting properties of indium porphyrins
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Optical limiting properties in CH2Cl2 solution of a series of axially substituted InTPP (indium tetraphenyl-porphyrin) and axially substituted InTTP (indium tetra-p-tolyl-porphyrin) are investigated using a 532nm laser with a pulse duration of 5 ns. The axial substitutions include -Cl, -SCN, -SPh and -SPh(p-Me). The optical limiting measurements reveal that the optical limiting properties of the indium porphyrins are greatly influenced by the axially attached functional groups. A limiting threshold of 0.18 J/cm2 is achieved for TTPInSCN, which is the best optical limiting material in this report. Z-scan experiments are also conducted and confirm that the good optical limiting performance of these indium porphyrins is due to the large value of σex/σg.
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Siau Gek Ang, How Ghee Ang, Wei Han, Bai Wang Sun, May Ka Yuen Lee, Yiew Wang Lee, and Guo Ying Yang "Influence of axial substitution on the optical limiting properties of indium porphyrins", Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002);

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