| Presentation | 2019-01-25 [Poster Presentation] Improved Flexoelectric Coefficient Measurement by Means of Transmission Ellipsometry Takashi Onishi, Munehiro Kimura, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In nematic liquid crystal (NLC), the electrical polarization effect which is called flexoelectricity occurs under splay or bend distortion. Up to today, several kinds of measurement methods has been reported. Even when the subject NLC was the same, however, the obtained flexoelectric coefficients and sign was different. In this study, monochromatic ellipsometry was applied to measure the flexoelectric coefficient. The new measurement procedure is for the summation of flexoelectric coefficients under splay ($e_11$) and bend ($e_33$) deformation, i.e. $e_p$ (=$e_11$+$e_33$) and difference $e_n$ (=$e_11$-$e_33$). The optical phase difference $Delta$ through hybrid aligned NLC cell with alignment deformation caused by DC electric field is measured. The NLC cell used possesses planar and hybrid alignment regions. As for estimating $e_p$, the SOITE method which is insensitive to multiple interference and multiple reflection was applied, and for $e_n$, the dependence of the phase difference on the applied electric field at normal incidence was evaluated. It was demonstrated that the cell thickness and the flexoelectric coefficients $e_p$ and $e_n$ can be determined by numerical fitting procedure. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | nematic liquid crystal / flexoelectric effect / ellipsometry |
| Paper # | EID2018-18 |
| Date of Issue | 2019-01-17 (EID) |
| Conference Information | |
| Committee | EID / ITE-IDY / IEIJ-SSL / SID-JC / IEE-EDD |
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| Conference Date | 2019/1/24(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kagoshima University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | 小南 裕子(静岡大) / Yoshihide Fujisaki(NHK) |
| Vice Chair | 木村 睦(龍谷大) / 志賀 智一(電通大) / 山口 留美子(秋田大) / Munehiro Kimura(Nagaoka Univ. of Tech.) |
| Secretary | 木村 睦(NTT) / 志賀 智一(東工大) / 山口 留美子(Shizuoka Univ.) / Munehiro Kimura(Tohoku Univ.) |
| Assistant | 奥野 武志(ファーウェイ) / 中田 充(NHK) / 野中 亮助(東芝) / Takuya Hasegawa(Koch Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Electronic Information Displays / Technical Group on Information Display / * / Society for Information Display Japan Chapter / Technical Group on Electron Devices |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Poster Presentation] Improved Flexoelectric Coefficient Measurement by Means of Transmission Ellipsometry |
| Sub Title (in English) | |
| Keyword(1) | nematic liquid crystal |
| Keyword(2) | flexoelectric effect |
| Keyword(3) | ellipsometry |
| 1st Author's Name | Takashi Onishi |
| 1st Author's Affiliation | Nagaoka University of Technology(NUT) |
| 2nd Author's Name | Munehiro Kimura |
| 2nd Author's Affiliation | Nagaoka University of Technology(NUT) |
| Date | 2019-01-25 |
| Paper # | EID2018-18 |
| Volume (vol) | vol.118 |
| Number (no) | EID-422 |
| Page | pp.pp.117-120(EID), |
| #Pages | 4 |
| Date of Issue | 2019-01-17 (EID) |