Equivalent circuit modeling of non-uniformly distributed nano Ag doped holographic polymer dispersed liquid crystal grating
Received:January 19, 2017  Revised:February 21, 2017  download
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Author NameAffiliationE-mail
Liu You-Rong School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and Technology yourongliu@sina.com 
ZHENG Ji-Hong University of Shanghai for Science and Technology jihongzheng@sina.com 
GUI Kun (University of Shanghai for Science and Technology 183367852@qq.com 
WANG Kang-Ni   
ZHUANG Song-Ling   
Abstract:The diffraction efficiency of the holographic polymer-dispersed liquid crystal (H-PDLC) grating can be adjusted by the applied electrical field. Doping Ag nanoparticles (NPs) can effectively reduce the driving voltage of the grating. Due to the influence of polymerization kinetics, Ag NPs are distributed unevenly in the grating, namely, the distribution of Ag NPs in the polymer and LC area is not uniform and exhibit different electric field control characteristics. The relationship between the threshold driving voltage and the frequency of the applied field can be studied by equivalent circuit model. According to Wagner-Maxwell effect, in this paper, the equivalent circuit model of Ag NPs surrounded by LC and polymer, respectively, was established. Under the condition of different concentration of Ag NPs within the LC area, the relaxation time and relaxation frequency of Ag NPs doped H-PDLC grating was studied. The low driving voltage can be further obtained by adjusting the frequency of applied electric field. The distribution of Ag NPs in the grating can be determined by the optimum driving electric field frequency range, and it is confirmed that the Ag NPs are concentrated in the LC strip and distributed in a small amount in the polymer stripes.
keywords:Holographic polymer dispersed liquid crystal, relaxation oscillation frequency, Threshold driving voltage, Non-uniform distribution
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Copyright:《Journal of Infrared And Millimeter Waves》