Authors:
Maria Raposo
;
Ana Rita Monteiro Timóteo
and
Paulo António Ribeiro
Affiliation:
CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, UNL, Campus de Caparica, 2829-516, Caparica and Portugal
Keyword(s):
Birefringence, PAZO, Layer-layer Films, Wavelength.
Related
Ontology
Subjects/Areas/Topics:
Photonic and Optoelectronic Materials and Devices
;
Photonics
;
Photonics, Optics and Laser Technology
Abstract:
The influence of wavelength of writing laser beam in the photoinduced birefringence dynamics on layer-by-layer (LBL) films of poly(allylamine hydrochloride) (PAH) and poly{1-(4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido)-1,2-ethanediyl, sodium salt} (PAZO) was investigated. Results revealed that the increase of laser wavelength lead to a slower birefringence build up process, whereas the relaxation process stands approximately unchanged. The buildup celerity was shown to follow the film absorbance with wavelength. The imposition of excess energy density to the PAH/PAZO LBL film was also shown to induce morphological changes in the film surface,which are also wavelength dependent.