19 February 2009 Liquid crystal variable focus lens based on Fresnel zone plate
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Abstract
The liquid crystal (LC) variable focus lens combining LC Fresnel Zone Plate with spherical lens (FZP-S) presented in the paper is an electro-optical system using the applied voltages to control the variation of its focal length. Theoretical study for the mathematic model of the hybrid FZP-S lens shows that the focus length of the hybrid lens can use the similar method to that of the system with conventional refractive lens. The LC FZP with the electrodes widths vary as a FZP which was fabricated on a glass substrate with two layers of transparent electrodes in our experiment. The minimum of the electrodes width is 1.2um.The advantage of such system is that the focal length of which can be changed electrically without mechanical movement. The effect of the focus length variation was verified by the experiment results.
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Qi Wang, Qi Wang, Da-Wei Zhang, Da-Wei Zhang, Jia-Bi Chen, Jia-Bi Chen, Song-Lin Zhuang, Song-Lin Zhuang, } "Liquid crystal variable focus lens based on Fresnel zone plate", Proc. SPIE 7279, Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration, 72791X (19 February 2009); doi: 10.1117/12.823827; https://doi.org/10.1117/12.823827
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