Title page for etd-0802110-013725


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URN etd-0802110-013725
Author Yu-yin Wang
Author's Email Address No Public.
Statistics This thesis had been viewed 5352 times. Download 3387 times.
Department Physics
Year 2009
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Studies of the electro-optical properties of liquid-crystal Fresnel lens based on cholesteric blue phase
Date of Defense 2010-07-15
Page Count 82
Keyword
  • polarization independence
  • electrically controlled blue phase Fresnel lens
  • Abstract In this study, a liquid crystal Fresnel lens based on the cholesteric blue phase liquid crystals is proposed. Blue phases are liquid-crystalline phases that appear in a very small temperature range between a cholesteric phase and an isotropic phase. There are three types of blue phases; BPⅠ,BPⅡ and BPⅢ. The BPⅠ and BPⅡ are characterized by a spatially periodic director field with lattice constants comparable to the wavelength of visible light. Because of the structural symmetry, blue phases are optically isotropic.
      In this study, the electro-optical properties of the BPⅡ under different applied voltages are investigated. The results reveal that the Bragg reflection of the BPII has a red shift by increasing the applied voltage and a phase transition from BPII to cholesteric phase occurs at the high voltage regime (>100V). Based on the results, an electrically controlled blue phase Fresnel lens with polarization independence and high diffraction efficiency is demonstrated.
    Advisory Committee
  • Chi-Yen Huang - chair
  • Chie-Tong Kuo - co-chair
  • Chi-Huang Lin - advisor
  • Files
  • etd-0802110-013725.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2010-08-02

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