Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1537873 | Optics Communications | 2011 | 5 Pages |
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.