http://doi.org/10.1380/ejssnt.2017.7
Regular Paper
Muhammad Samir Ullah1) 2), Shohei Asai1), Yousuke Inomata1), Khuat Thi Thu Hien1), Goro Mizutani1), Yoshitaka Murakami3), Takashi Okada3)
1) School of Materials Science, Japan Advanced Institute of Science and Technology 2) Department of Physics, Bangladesh University of Engineering and Technology 3) LCD Materials 2nd Laboratory, Display Materials Research Laboratories, JSR Corporation
Keywords: Second harmonic generation methods, Amorphous thin films, Surface structure, morphology, roughness, and topography, Liquid crystal displays (LCDs), Polyimide, Rubbing treatment
We have studied the optical second harmonic generation (SHG) of a rubbed novel polyimide (PI) film having steroidal structure side chains prepared by spin coating on an indium tin oxide (ITO)-coated glass substrate. The second order nonlinear susceptibility χijk(2) elements were obtained from the fitting of the SHG data. The symmetry of the polymer chains roughly belonged to Cs symmetry with the rubbing direction parallel to the mirror plane. The average polar (tilt) angle of the rubbed PI chains was determined to be around 16° by using the measured χijk(2) elements. [DOI: 10.1380/ejssnt.2017.7]
