Photophysical and nonlinear optical properties of zincphthalocyanines with peripheral substitutions |
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| Authors: | H. Manaa A. Tuhl J. Samuel A. AL-Mulla N.A. AL-Awadi S. Makhseed |
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| Affiliation: | a Physics department, Kuwait University, P.O. Box 5969, Safat-13060, Kuwaitb Department of Chemistry, Kuwait University, P.O. Box 5969, Safat-13060, Kuwait |
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| Abstract: | Photophysical and nonlinear optical properties of zinc phthalocyanines (ZnPc) bearing peripheral phenoxy substituents containing different functionalized groups were studied. Fluorescence spectra corresponding to the optical transition S1 → S0 are found to be appeared at 684 or 686.4 nm. Z-scan technique reveals large nonlinearities, where the absorptive and refractive effects are separately evaluated. Saturation absorption of ZnPc-1 was observed at 632.8 nm, with a very large nonlinear absorption coefficient β = −1.36 × 10−2 cm/W. However a strong nonlinear refractive effect was found in all ZnPcs (1-4). Transmitted versus incident irradiance measurements carried out on ZnPc-1 and ZnPc-2, showed a very clear optical limiting behavior with irradiance thresholds around be 44 W/cm2 and 90 W/cm2 respectively. |
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| Keywords: | Z-scan Nonlinear optics Phthalocyanine Optical limiting |
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