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.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0903109-180609 |
| Date | 03 September 2009 |
| Creators | Wang, Jhong-yuan |
| Contributors | Chie-Tong Kuo, Chi-Huang Lin, Chi-Yen Huang, Yong- Guei Fu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903109-180609 |
| Rights | withheld, Copyright information available at source archive |
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