Applied Physics B

, Volume 91, Issue 1, pp 149–156

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

  • N. Venkatram
  • D. Narayana Rao
  • L. Giribabu
  • S. Venugopal Rao
Article

DOI: 10.1007/s00340-008-2934-5

Cite this article as:
Venkatram, N., Narayana Rao, D., Giribabu, L. et al. Appl. Phys. B (2008) 91: 149. doi:10.1007/s00340-008-2934-5

Abstract

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.

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • N. Venkatram
    • 1
  • D. Narayana Rao
    • 1
  • L. Giribabu
    • 2
  • S. Venugopal Rao
    • 3
  1. 1.School of PhysicsUniversity of HyderabadHyderabadIndia
  2. 2.Nanomaterials Laboratory, Inorganic & Physical Chemistry DivisionIndian Institute of Chemical TechnologyHyderabadIndia
  3. 3.Department of PhysicsIndian Institute of Technology GuwahatiGuwahatiIndia