en عمومى General پژوهشي Research We have studied light-induced birefringence (LIB) and surface relief grating (SRG) formation in the series of methylacrylate polymers. The effect of material structure such as length of photochromic side chain, glass transition temperature and molecular structure of azo units on LIB and SRG are studied. The optical formation of self-induced SRG on films of these materials is also presented. Surface relief grating, lightinduced birefringence, methylacrylate polymers, photoisomerization 23 30 http://ijop.ir/browse.php?a_code=A-10-44-1&slc_lang=en&sid=1 S. Ahmadi-Kandjani s_ahmadi_k@yahoo.com 10031947532846001081 10031947532846001081 Yes Research Institute for Applied Physics and Astronomy, University of Tabriz P. Tajalli 10031947532846001082 10031947532846001082 No Laboratoire POMA, Université d'Angers, Angers, France H. Khoshsima 10031947532846001083 10031947532846001083 No Research Institute for Applied Physics and Astronomy, University of Tabriz R. Barille 10031947532846001084 10031947532846001084 No Laboratoire POMA, Université d'Angers, Angers, France J. M. Nunzi 10031947532846001085 10031947532846001085 No Department of Chemistry, Chernoff Hall, Queen's University, Canada P. Kucharski 10031947532846001086 10031947532846001086 No Wroclaw University of Technology, Faculty of Chemistry, Department of Polymer Engineering and Technology, Wroclaw, Poland. H. Tajalli 10031947532846001087 10031947532846001087 No Faculty of Physics, University of Tabriz,