We investigated the third-order nonlinear optical (NLO) properties of three poly(2',5'-dioctyloxy-4,4',4"-terphenylenevinylene)s having different cis/trans-vinylene ratios. The nonlinear measurements were performed at lambda = 532 nm in chloroform solutions using single-beam Z-scan technique with picosecond laser pulses. All the investigated polymers exhibit a moderate two-photon resonance at this wavelength. On the contrary, the magnitude of the nonlinear refractive index is high and shows a considerable dependence on the cis/trans ratio of the double bonds. The largest third-order nonlinear optical susceptibility, chi((3)) = (5 +/- 1) x 10(-10) esu, was measured for a polymer with all monomers having vinylene unit in trans-configuration. (C) 2003 Elsevier Science B.V. All rights reserved.
chi((3)) measurements in novel poly (2 ',5 '-dioctyloxy-4,4 ',4 ''-terphenylenevinylene) using the Z-scan technique
TOMMASI, Raffaele;BABUDRI, Francesco;FARINOLA, Gianluca Maria;
2003-01-01
Abstract
We investigated the third-order nonlinear optical (NLO) properties of three poly(2',5'-dioctyloxy-4,4',4"-terphenylenevinylene)s having different cis/trans-vinylene ratios. The nonlinear measurements were performed at lambda = 532 nm in chloroform solutions using single-beam Z-scan technique with picosecond laser pulses. All the investigated polymers exhibit a moderate two-photon resonance at this wavelength. On the contrary, the magnitude of the nonlinear refractive index is high and shows a considerable dependence on the cis/trans ratio of the double bonds. The largest third-order nonlinear optical susceptibility, chi((3)) = (5 +/- 1) x 10(-10) esu, was measured for a polymer with all monomers having vinylene unit in trans-configuration. (C) 2003 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
