Title page for etd-0903109-180609


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URN etd-0903109-180609
Author Jhong-yuan Wang
Author's Email Address No Public.
Statistics This thesis had been viewed 5352 times. Download 3673 times.
Department Physics
Year 2008
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Studies of polarization-independent liquid-crystal Fresnel lenses with high diffraction efficiency
Date of Defense 2009-07-21
Page Count 124
Keyword
  • Fresnel lenses
  • liquid-crystal
  • polarization-independent
  • Abstract This study proposes a polarization-independent liquid-crystal Fresnel lens using twisted nematic liquid crystals (TN-LCs) with two electrodes structure. A photoresist type has high diffraction efficiency, high diffraction efficiency and good polarization independence characteristic. However, its diffraction cannot be completely switched off. A patterned electrode type has the characteristics of the switch-off and good polarization independence. However, it has low diffraction efficiency. We improve the patterned electrode type with two electrodes structure. Experimental results reveal that LC Fresnel lens using the TN-LC with two electrode structures has high diffraction efficiency and a good polarization-independent characteristic.
    Advisory Committee
  • Chie-Tong Kuo - chair
  • Yong- Guei Fu - co-chair
  • Chi-Yen Huang - co-chair
  • Chi-Huang Lin - advisor
  • Files
  • etd-0903109-180609.pdf
  • indicate accessible in a year
    Date of Submission 2009-09-03

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