Title: Dynamic characterization of photo-alignment of azo-dye-doped polymer using phase modulated polarimetry
Authors: Chuang, Chun-I
Lin, Shivan-Huei
Chao, Yu-Faye
Department of Electrophysics
Department of Photonics
Keywords: Anisotropic refractive index ellipsoid;Phase modulated polarimetry;Azo-benzene;Photo-induced molecular reorientation
Issue Date: 1-Jan-2013
Abstract: Using a combination of two-probe-beam phase modulated polarimetry and a waveform extraction technique, we show it is possible to determine all the optical parameters of an anisotropic medium. Particularly, we have measured the dynamic changes of refractive index ellipsoid of the disperse red 19-doped poly(methyl methacrylate) under the irradiation of linear polarized lights. The long axis of the trans molecule can be aligned to the propagation direction of P-polarized light while it is irritated by two crossed polarized lights. The refractive indices and orientation angles can be determined in one cycle of modulation (20 mu s) with sufficient precision of 10(-6) and 0.1 degrees, respectively. This work shows a new way to simultaneously monitor and control the photo-alignment process of azobenzene molecules in a polymer matrix. (c) 2012 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.optmat.2012.09.026
ISSN: 0925-3467
DOI: 10.1016/j.optmat.2012.09.026
Volume: 35
Issue: 3
Begin Page: 366
End Page: 371
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