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URN	etd-0826111-172600
Author	Cheng-Wei Hsieh
Author's Email Address	No Public.
Statistics	This thesis had been viewed 5352 times. Download 464 times.
Department	Physics
Year	2010
Semester	2
Degree	Master
Type of Document
Language	zh-TW.Big5 Chinese
Title	Studies of the surface treatment effect for the optoelectronic properties of cholesteric blue phase liquid crystals
Date of Defense	2011-07-14
Page Count	75
Keyword	phase transitions lattice blue phase electrostriction Bragg reflection liquid crystal
Abstract	In this study, we researched three kinds of surface treatment (no surface treatment, homogeneous alignment (HA) and vertical alignment (VA)) effect for the optoelectronic properties of cholesteric blue phase liquid crystals (BPLCs). We demonstrate the surface treatments have influence on the temperature range of BPLCs. The VA-BPLC possesses the widest temperature range, about 6.0 ℃. The temperature range of both no surface treatment BPLC and HA-BPLC are about 5.5 ℃. In the process of cooling, the surface treatments will restrain the change of the pitch of BPLC. Besides, surface treatment will let the crystalline of BPLC shipshape, so that it can reduce the scattering of the reflection light of BPLC. In the vertical electric field, the reflection wavelength of BPLC will be red-shift when the applied voltage increased. The reflection wavelength of the HA-BPLC can be tuned about 90 nm. The reflection wavelength of the VA-BPLC can be tuned about 120 nm. We have demonstrated the treatment of vertical alignment will reduce the operating voltage of BPLC.
Advisory Committee	Chie-Tong Kuo - chair Chi-Yen Huang - co-chair Chi-Huang Lin - advisor
Files	etd-0826111-172600.pdf Indicate in-campus at 2 year and off-campus access at 5 year.
Date of Submission	2011-08-26

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