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Ultrafast Nonlinear Optical and Optical Limiting Properties of Phthalocyanine Thin Films Studied Using Z-Scan

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DOI: 10.4236/msa.2011.25039    6,391 Downloads   12,242 Views   Citations

ABSTRACT

We have investigated the nonlinear optical properties, optical limiting thresholds, and figures of merits for five different phthalocyanine thin films, achieved through doping in PMMA polymer, using the Z-scan technique at 800 nm with 2 ps laser pulse excitation. From the open-aperture Z-scan data we derived that these molecules exhibit strong two photon absorption (2PA) with the nonlinear coefficients in the range of 15 - 200 cm/GW. We have also estimated the sign and magnitude of real part of third order nonlinearity through the closed aperture data. Preliminary femtosecond pump-probe data suggests that the lifetimes of excited states are in the sub-100 ps regime for all the molecules in film form. Our studies provide concrete evidence that these phthalocyanines are prospective candidates for multi-photon imaging and optical limiting applications.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

S. Rao, P. Anusha, T. Prashant, D. Swain and S. Tewari, "Ultrafast Nonlinear Optical and Optical Limiting Properties of Phthalocyanine Thin Films Studied Using Z-Scan," Materials Sciences and Applications, Vol. 2 No. 5, 2011, pp. 299-306. doi: 10.4236/msa.2011.25039.

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