Abstract

RODRIGUEZ, A.; VITRANT, G.; CHOLLET, P.A.  and  KAJZAR, F.. Photochromic properties of azo dye polymer thin films: evidence of an additional reversible mechanism of molecular behaviour. Rev. mex. fis. [online]. 2006, vol.52, n.2, pp.135-138. ISSN 0035-001X.

Photoinduced refractive index and absorption anisotropies in thin films of an azo dye polymer have been carried out by pump-probe experiments. A refractive index change of Δn=-0.04 was obtained by independently measuring the two indices, parallel and perpendicular to pump light polarization. A long-term stability of the induced birefringence and a reversible photoinduced memory effect have been observed. The experimental results cannot be completely explained by the proposed photoisomerization models to describe the process involved.

Keywords : Photochromic polymers; optical waveguides; photoinduced refractive index.

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