Applied Physics B

, Volume 91, Issue 1, pp 149-156

First online:

Nonlinear optical and optical limiting studies of alkoxy phthalocyanines in solutions studied at 532 nm with nanosecond pulse excitation

  • N. VenkatramAffiliated withSchool of Physics, University of Hyderabad
  • , D. Narayana RaoAffiliated withSchool of Physics, University of Hyderabad
  • , L. GiribabuAffiliated withNanomaterials Laboratory, Inorganic & Physical Chemistry Division, Indian Institute of Chemical Technology
  • , S. Venugopal RaoAffiliated withDepartment of Physics, Indian Institute of Technology Guwahati Email author 

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We report our results on the nonlinear optical and optical limiting properties of two alkoxy phthalocyanines namely 2,3,9,10,16,17,23,24-octakis-(heptyloxy) phthalocyanine and 2,3,9,10,16,17,23,24-octakis-(heptyloxy) phthalocyanine zinc(II) studied at a wavelength of 532 nm using 6 ns pulses. Using the standard Z-scan technique we observed that both the phthalocyanines exhibited negative nonlinearity as revealed by the signature of closed aperture data. The magnitude of the nonlinear refractive index n2 evaluated from the closed aperture data was ∼ 1.61×10-11 cm2/W for the free-base phthalocyanine and ∼ 1.56×10-11 cm2/W for the metallic phthalocyanine. Open aperture Z-scan data indicates strong nonlinear absorption in both the phthalocyanines with measured nonlinear coefficients of ∼ 1650 cm/GW and ∼ 1850 cm/GW respectively. We also report optical limiting properties of these phthalocyanines with limiting thresholds (I1/2) of ∼ 0.5 J/cm2. Our studies suggest that these phthalocyanines are one of the best molecules for nonlinear optical applications studied recently.