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Dynamics of Photoinduced Anisotropy in Poly(Methyl Methacrylate) Doped with DO3
New Phys.: Sae Mulli 2019; 69: 867~873
Published online August 30, 2019;
© 2019 New Physics: Sae Mulli.

Yang WU1, Hyo Jin SEO1, Sun Il KIM*1, Dong Soo CHOI2, Hyun Kwan SHIM3

1부경대학교 물리학과, 부산 48513, 대한민국
2동아대학교 신소재물리학과, 부산 49315, 대한민국
3부경대학교 화학과, 부산 48513, 대한민국
Correspondence to:
Received June 7, 2019; Revised July 1, 2019; Accepted August 5, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Optical anisotropy was produced by using a linearly polarized pump beam in poly (methyl methacrylate) doped with Disperse Orange 3 (DO3). The dynamics of photoinduced anisotropy was studied by measuring the change in anisotropic absorption and comparing it to the change in isotropic absorption induced by using a circularly polarized pump beam. The temporal evolution of the anisotropic absorption was monitored under irradiation at 477~nm. Photo-isomerization plays a leading role in the isotropic absorption change during the early time evolution, and the angular hole burning and the angular redistribution induces an anisotropic absorption change in the pumping process. A polarized pump beam causes the accumulation of trans isomers in the perpendicular direction and cis isomers in the parallel direction over time. The relaxation process is governed by thermal isomerization at the initial time and by the rotational diffusion of trans isomers and cis isomers at later times.
PACS numbers: 42.65.An, 42.70.Jk, 78.20.Ci
Keywords: Photoinduced Anisotropy, DO3, Order parameter, Angular hole burning, Angular redistribution 

February 2020, 70 (2)
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