DocumentCode :
1341277
Title :
Polarization-Independent Liquid-Crystal Fresnel Lenses Based on Surface-Mode Switching of 90 
Twisted-Nematic Liquid Crystals
Author :
Lin, Chi-Huang ; Huang, Hsien-Yi ; Wang, Jhong-Yuan
Author_Institution :
Dept. of Phys., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Volume :
22
Issue :
3
fYear :
2010
Firstpage :
137
Lastpage :
139
Abstract :
A simple polarization-independent liquid-crystal Fresnel lens is developed using the surface-mode switching of 90?? twisted-nematic liquid crystals (TN-LCs). In the surface-mode switching of LCs, the major reorientation of LCs occurs near the substrates. Optical calculations indicate that 90?? TN-LCs are polarization-independent under surface-mode switching, when the applied voltage exceeds four times the threshold voltage for director reorientation. The maximum tunable phase shift in this polarization-independent state of 90?? TN-LCs is ~11% of LC cell retardation. An LC Fresnel lens that is polarization-independent and has a fast response with a response time of <10 ms is demonstrated using the surface-mode switching of 90?? TN-LC.
Keywords :
Fresnel diffraction; lenses; light polarisation; nematic liquid crystals; substrates; director reorientation; liquid crystal Fresnel lenses; simple polarization independent; substrates; surface mode switching; twisted nematic liquid crystals; Fresnel lens; polarization independent; surface mode; twisted-nematic liquid crystal (TN-LC);
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2009.2036738
Filename :
5340633
Link To Document :
