Coplanar alignment of mesogenic groups using polymer films of a methacrylate comprising a photocrosslinkable -(2-cinnamoyloxyethoxy)-biphenyl group and a photoinactive 4-cyanobiphenyl group was realized by slantwise ultraviolet (UV) irradiation. Slantwise absorption measurement revealed that an orientational plane of the mesogenic groups was perpendicular to direction of the UV light propagation. The orientational angle and the ellipsoid of refractive index of the film could be regulated by changing the irradiation angle and degree of polarization of the UV exposure, respectively.
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16.
Absorbances at various angle of incident monitoring light were corrected by taking into account of refractive index and path length of the film.
17.
Degree of the polarization of UV light was controlled by changing the ratio of the irradiation dose of nonpolarized UV exposure and linearly polarized one.
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