S. V. Rao, N. Venkatram, L. Giribabu and D. N. Rao, “Ultrafast Nonlinear Optical Properties of Phthalocyanines Nanoparticles at 800 nm Studied Using Z-Scan,” Journal of Applied Physics, Vol. 105, No. 5, March 2009, pp. 053109-053109-6. doi:10.1063/1.3079801

has been cited by the following article:

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

  AUTHORS: Soma Venugopal Rao, Puliparambil Thilakan Anusha, Turaga Shuvan Prashant, Debasis Swain, Surya P. Tewari

  KEYWORDS: Z-Scan, Phthalocyanines, Thin Films, Picosecond, Figures of Merit

  JOURNAL NAME: Materials Sciences and Applications, Vol.2 No.5, May 5, 2011

  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.