Research On The Impact Of Doping And Surface Plasmon Polaritons On Photorefractive Effect Of Liquid Crystal

In recent years,with the rapid development of virtual reality,research of photorefractive(PR)effect of liquid crystal(LC)based on real-time holographic record and display has attracted a great attention.Meantime,research on surface plasmon polaritons(SPPs)has been deeply developed.Due to the indispensable role played by SPPs in micro-nano devices,scientists have pay much attention to the research of SPPs.This paper will start by reviewing the advancement of research and development of PR effect in LC and SPPs.Utilizing the ZLI-5200-100 super-twisted nematic LC cells with ZnSe interlayer which have a wide applicable temperature range as our research object,we compared the PR properties of pure,C60-doped and dye-doped(in three different mass concentration 0.01 wt.%,0.1 wt.% and 0.5 wt.%,respectively)systems,and obtained a good PR performance of C60-doped system with as high as 20.7% diffraction efficiency while the response time is reduced to less than 10 ms.Moreover,we have found an effect that the diffraction efficiency of a probing beam can be amplified by single writing beam.This effect is a solid evidence of the excitation of SPPs on the LC/ZnSe interface.Through calculating the charge accumulation in the modified layer at the LC/ZnSe interface,we conclude that the cells we studied satisfy the condition of SPPs excitation at 561 nm.Based on the SPPs model,we have given a better explanation of the variation with external electric field of diffraction efficiency and the difference between the LC systems.In the last part of this work,according to the concrete condition,theoretical calculation and derivation of the excitation of SPPs on the LC/ZnSe interface has been done.The findings of this work can offer an approach to improving the PR performance of nematic liquid crystals by doping with C60 and dye,a method of low-loss excitation and a possible application situation of SPPs.