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You searched for id:"oai:NSYSU:etd-0808117-151716". One record found.

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NSYSU

1. Jhuang, Tian-yi. The study of Fresnel lens in twisted-nematic liquid crystal fabricated by Sagnac interferometer.

Degree: Master, Physics, 2017, NSYSU

This study presents a focusing efficiency and focal length tunable Fresnel lens with liquid crystals fabricated by a Sagnac interferometer. When the Fresnel-pattern green beam, formed by the Sagnac interferometer, is irradiated on the azo-dye doped liquid-crystal mixture, the azo-dye molecules will undergo the trans-cis photoisomerization and then generate photo-alignment effect in the bright (odd) zone, which results that the direction of liquid-crystal molecules will perpendicular to the linearly polarized pump beam. The various structures of liquid crystals in the odd and even zones will produce the phase difference, resulting in a Fresnel lens generated. The focusing efficiency of proposed Fresnel lens can be controlled by the external AC voltages. The experimental results show that the focusing efficiency can reach its maximum of 31.5 % under applied voltage of 3.1 V. In addition, the photo-alignment effect of azo dyes can be erased through the thermally method and rewritten by the pump beam with different Fresnel-like pattern, which leads to the Fresnel lens with various focal lengths. Advisors/Committee Members: Guan-yu Zhuo (chair), Shih-hung Lin (chair), Chie-tong Kuo (committee member).

Subjects/Keywords: Sagnac interferometer; Fresnel lens; photo-alignment; azo dyes; rewritable

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jhuang, T. (2017). The study of Fresnel lens in twisted-nematic liquid crystal fabricated by Sagnac interferometer. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808117-151716

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Jhuang, Tian-yi. “The study of Fresnel lens in twisted-nematic liquid crystal fabricated by Sagnac interferometer.” 2017. Thesis, NSYSU. Accessed September 22, 2017. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808117-151716.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Jhuang, Tian-yi. “The study of Fresnel lens in twisted-nematic liquid crystal fabricated by Sagnac interferometer.” 2017. Web. 22 Sep 2017.

Vancouver:

Jhuang T. The study of Fresnel lens in twisted-nematic liquid crystal fabricated by Sagnac interferometer. [Internet] [Thesis]. NSYSU; 2017. [cited 2017 Sep 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808117-151716.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jhuang T. The study of Fresnel lens in twisted-nematic liquid crystal fabricated by Sagnac interferometer. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808117-151716

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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