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Studies of polarization-independent liquid-crystal Fresnel lenses with high diffraction efficiency

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.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0903109-180609
Date03 September 2009
CreatorsWang, Jhong-yuan
ContributorsChie-Tong Kuo, Chi-Huang Lin, Chi-Yen Huang, Yong- Guei Fu
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903109-180609
Rightswithheld, Copyright information available at source archive

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