npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2019; 69: 867-873

Published online August 30, 2019

Copyright © New Physics: Sae Mulli.

Dynamics of Photoinduced Anisotropy in Poly(Methyl Methacrylate) Doped with DO3

DO3가 첨가된 poly(methyl methacrylate)에서 광유도비등방성의 동역학

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


Received: June 7, 2019; Revised: July 1, 2019; Accepted: August 5, 2019

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.

Keywords: Photoinduced Anisotropy, DO3, Order parameter, Angular hole burning, Angular redistribution ,

DO3(Disperse Orange 3)를 첨가한 poly(methyl methacrylate) 박막에 선편광된 빛을 쪼여 비등방성을 유도하였다. 비등방적 흡광도의 변화와 원편광된 빛으로 여기된 등방적 흡광도 변화를 비교하여 비등방성의 동역학을 분석하였다. 비등방적 흡광도의 시간적 거동은 파장 477~nm에서 측정되었다. 펌프광을 쪼이는 초기에는 광이성질화의 과정이 등방적 흡광도변화를 주도하고 각홀버닝(angular hole burning)과 각재분포(angular redistribution)가 잇달아 비등방성을 유도한다. 선편광된 빛이 직각방향으로 트랜스 이성체를 축적하고 평행방향으로는 시스 이성체를 축적한다. 이완과정은 초기에는 열적 역이성질화가 나타나고 점차 트랜스 이성체와 시스 이성체의 회전분산효과가 나타난다.

Keywords: 광유도 비등방성, DO3, 광정렬도, 각홀버닝, 각재분포

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