Title page for etd-0721108-172440


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URN etd-0721108-172440
Author Zheng-hsiung Chen
Author's Email Address No Public.
Statistics This thesis had been viewed 5355 times. Download 26 times.
Department Physics
Year 2007
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Studies of characteristics of frequency modulation liquid-crystal optoelectronic devices
Date of Defense 2008-07-17
Page Count 131
Keyword
  • frequency modulation
  • liquid crystal
  • optoelectronic device
  • dual frequency
  • MLC-2048
  • lens
  • Abstract   We study the characteristics of the dual frequency liquid-crystal (LC) optoelectronic devices in this literary. We fabricate the LC lens with the dual frequency liquid crystal in our experiment.
      In this study, we first prepare a parabolic polymer structure on the glass substrate to form a polymeric lens glass, then, fill the dual-frequency LC into the empty cell which consists of one ITO glass and the polymeric lens glass to fabricate a frequency modulation LC lens. Additionally, a hybrid surface alignment is also used for our LC lens. For the dual-frequency LC, a hybrid surface alignment is necessary to obtain a frequency modulation LC lens. Because of the polymeric lens, the electric fields are inhomogeneous distributions in the LC lens when a voltage is applied to the electrodes. In this situation, an inhomogeneous electric field is applied to the cell to create GRIN lens-like distribution of the gradient refractive index. Thus, the focusing effects occur when the light passes through the LC lens. Moreover, by changing the amplitude and frequency of the applied voltage, the focal length of the LC lens can be changed.
      We mainly discuss the optical property and the response time of the LC lens based on the voltage modulation and the frequency modulation. The experimental results reveal that the frequency modulation has more advantages, such as widen range of controlled focal length and faster response time, comparing with the voltage modulation.
    Advisory Committee
  • I-Min Jiang - chair
  • Chia-Rong Lee - co-chair
  • Chie-Tong Kuo - co-chair
  • Chi-Yen Huang - co-chair
  • Chi-Huang Lin - advisor
  • Files
  • etd-0721108-172440.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2008-07-21

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