Photophysical and nonlinear optical properties of zincphthalocyanines with peripheral substitutions

✍ Scribed by H. Manaa; A. Tuhl; J. Samuel; A. AL-Mulla; N.A. AL-Awadi; S. Makhseed

• Book ID: 104074408
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 757 KB
• Volume: 284
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2010.09.018

✦ Synopsis

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 S 1 → S 0 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/cm 2 and 90 W/cm 2 respectively.