Third-order optical non-linearity in Zn(II) complexes of 5,10,15,20-tetraarylethynyl-substituted porphyrins

Third-order optical nonlinearity chi((3)) of complexes in 5,10,15,20-tetraarylethynyl-substituted porphyrins has been measured using the Z-scan technique, The real and imaginary parts of chi((3)) Were measured at three different wavelengths and found to be in the region 1.05 x 10(-12) esu and 5.2 x 10(-12) esu, respectively. Experimental characterisation shows a saturation absorption at wavelengths close to resonance and reverse saturation absorption at off-resonance wavelengths.