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VOLUME 72 (2000) | ISSUE 8 | PAGE 595
Microscopic model of optically induced anisotropy of third order nonlinearity in azo-dye polymer systems
PACS: 42.65.-k, 42.70.Jk
The large photoinduced reversible change of third-harmonic generation in azo-dye polymer thin films has been recently observed. In present work, the microscopic interpretation of this phenomenon is given. The model presented is based on an angular hole burning and molecular reorientation due to trans-cis photoisomerization of azo-dye molecules.