Title page for etd-0826111-172600


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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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