Nonlinear Refraction of Peripheral-Substituted Zinc Phthalocyanines Investigated by Nanosecond and Picose-cond Z Scans

Yunjing Li, Timothy M Pritchett, Jiandong Huang, Meirong Ke, Wenfang Sun

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Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, USA.

DOI: 10.4236/opj.2011.12011                

Abstract

The singlet and triplet excited-state refraction cross-sections of dimethyl sulfoxide (DMSO) solutions of ten zinc phthalocyanine derivatives with mono-or tetra-peripheral substituents at 532 nm were obtained by simultaneous fitting of closed-aperture Z scans with both nanosecond and picosecond pulse widths. Self-focusing of both nanosecond and picosecond laser pulses was observed in all complexes at 532-nm wavelength. The complexes with tetra-substituents at the ?-position exhibit relatively larger refraction cross-sections than the other complexes. The wavelength dependence of the singlet refraction cross-section of a representative complex was observed to be non-monotonic in the range of 470 - 550 nm.

Keywords

Nonlinear Refraction; Zinc Phthalocyanine; Z Scan; Excited-State Refraction Cross-Section; Wavelength Dispersion

Conflicts of Interest

The authors declare no conflicts of interest.

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