Abstract
A driving force of photoinduced surface relief (PSR) formation is examined by considering the complex electric susceptibility of the absorbing medium. It is introduced into a fluid mechanics model established for the viscous fluid layer on a flat substrate. As a result, a theoretical model for PSR formation covering thoroughly from the origin of the driving force to the dynamic process forming the surface relief is established. A series of systematic experiments are carried out by means of one-dimensional sinusoidal and Gaussian beam irradiation and the results are reproduced well by the model calculation. The experimental results reported in former literature are also reviewed using this model and the result supports strongly our assumption: driving force derived from the interaction between the absorbing medium and optical electric field acts as a body force on the optically plasticized azopolymer. Further, from the consideration based on the model, some important features of PSR formation which have not been reported yet are suggested.
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