2003年4月
Helix unwinding process in the chiral smectic C phase of MHPOBC as observed by conoscopy
LIQUID CRYSTALS
- ,
- ,
- ,
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- 巻
- 30
- 号
- 4
- 開始ページ
- 499
- 終了ページ
- 505
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/0267829031000091147
- 出版者・発行元
- TAYLOR & FRANCIS LTD
Conoscopic studies have been made on the helix unwinding process in the chiral smectic C phase of MHPOBC. The unwinding process is rather unique in the sense that abrupt changes of the biaxiality and apparent tilt angle are followed by further gradual changes before the complete helix unwinding. The process is qualitatively explained by simulating the conoscopic images using the 4 x 4 matrix method with consideration of model molecular distributions, by taking account of both the ferroelectric and dielectric coupling between molecules and a field. The transmittance loss due to selective reflection was also measured under the application of a stepwise d.c. field. The shift of the dip position due to the loss, toward a longer wavelength region, was observed at low field. In contrast, the emergence of a transmittance loss at the same wavelength as that of an unperturbed state was observed. This phenomenon is explained by the ferroelectric deformation of a helix with the pitch unchanged.
- リンク情報
- ID情報
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- DOI : 10.1080/0267829031000091147
- ISSN : 0267-8292
- Web of Science ID : WOS:000182330300012