Ms. Jing Qin Profile

Jing Qin

at Harbin Inst of Technology

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Proceedings Article | 12 January 2009 Paper

Near-field birefringence response of IPS liquid crystal thin film detected by Bi-SNOM

Jing Qin, Norihiro Umeda

Proceedings Volume 7133, 71333D (2009) https://doi.org/10.1117/12.807778

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Dynamics information of nematic liquid crystal (NLC) in In-Plane-Switching (IPS) mode is attractive and important for applications of high vision angle techniques. In this paper, we used a novel evaluation method to detect the molecular orientation dynamics of NLC thin film in depth direction from its birefringence responses using birefringence scanning near-field optical microscopy (Bi-SNOM). In this method, a Bi-SNOM probe is inserted into IPS mode NLC thin film, in which the time responses of LC molecules at different position in depth are also measured. In addition, Molecular orientation hysteresis to the applied voltage is observed. We measured the orientation hysteresis of LC molecules at different position along the depth direction in the LC thin film. Experimental results show that the proposed method is effective and feasible for its consistence with original specialities.

Proceedings Article | 10 September 2007 Paper

Near-field birefringence response in thickness direction of liquid crystal thin film

Jing Qin, Norihiro Umeda

Proceedings Volume 6648, 664804 (2007) https://doi.org/10.1117/12.733340

KEYWORDS: Liquid crystals, Molecules, Thin films, Birefringence, Near field scanning optical microscopy, Second-harmonic generation, Near field optics, Glasses, Near field, Optical microscopes

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Information of molecular orientation in nematic LC (liquid crystal) is attractive and important for application in the field of display device. In this paper, we demonstrate a novel method using Birefringence Scanning Near-field Optical Microscope (Bi-SNOM) with a probe which is inserted into the LC thin film to detect the molecular orientation from its birefringence responses in the thickness direction of LC thin film. The probe is laterally vibrated while going forward into LC thin film, and the retardation and azimuth angle are being recorded as the probe going down. Since the affection of shear force acts as a stimulation to LC molecules, the orientation of molecules is changed and reorientated. In this study, LC thin film on homeotropic alignment LC film and homogenious alignment LC film were measured. In the case of homogenious alignment LC film, we propose two experiments; one is the experiment in which the vibration direction of probe is vertical to the alignment direction of PI film, and in the other experiment, we vibrated the probe in the direction parallel to the rubbing direction of alignment layer. We also compared the data measured with no vibration probe and the data measured with probe vibrated vertical to the alignment direction. As results, we obtained the orientation of molecules above the alignment layer by the birefringence response of LC molecules to the disturbance of vibrating probe and the anchoring extrapolation length by Polyimide (PI) alignment substrate. Ultimately, the LC thin film can be modeled in thickness direction from all the results using this method.

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