The orientation relaxation of azo-dyes upon all-optical poling was studied. Azo-dye doped amorphous polymers were poled for different durations by all-optical poling at several temperatures. A quasi-permanent macroscopic second-order nonlinear optical susceptibility chi((2)) was inscribed in the dye-doped centrosymmetric polymer systems. Relaxation of the chi((2)) was monitored by second harmonic generation. It shows that the polar orientation relaxation follows the duration of the poling process: the longer the poling, the slower the polar relaxation time. Causes of the orientation relaxation retardation are discussed. (c) 2006 Elsevier B.V. All rights reserved.
Chan, S.w., Nunzi, J.m., Quatela, A., Casalboni, M. (2006). Retardation of orientation relaxation of azo-dye doped amorphous polymers upon all-optical poling. CHEMICAL PHYSICS LETTERS, 428, 371-375 [10.1016/j.cplett.2006.07.028].
Retardation of orientation relaxation of azo-dye doped amorphous polymers upon all-optical poling
CASALBONI, MAURO
2006-01-01
Abstract
The orientation relaxation of azo-dyes upon all-optical poling was studied. Azo-dye doped amorphous polymers were poled for different durations by all-optical poling at several temperatures. A quasi-permanent macroscopic second-order nonlinear optical susceptibility chi((2)) was inscribed in the dye-doped centrosymmetric polymer systems. Relaxation of the chi((2)) was monitored by second harmonic generation. It shows that the polar orientation relaxation follows the duration of the poling process: the longer the poling, the slower the polar relaxation time. Causes of the orientation relaxation retardation are discussed. (c) 2006 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
