Theoretical Research On Surface Plasma Dynamic Holographic Imaging

With the continuous progress of scientific and technological exploration,human beings are now living in the era of information.Traditional two-dimensional display technology has been unable to fully express the information needed by human beings,and the three-dimensional display technology which carries very comprehensive information,has been developed vigorously.Holographic Display Technology,as one of the most promising three-dimensional display technology,has attracted the attention of a large number of scholars.The existing dynamic display technology combines computational holography with high resolution spatial light modulator to produce dynamic holographic image.However,due to the interference of the holographic materials and the zero-order light of the system,high-resolution,high-quality display images can not be obtained,the development of dynamic holographic is still very slow.Based on surface plasmon holography,the evanescent wave electromagnetic mode is used instead of the spatial propagation electromagnetic mode as the reference light in the holographic process,which can effectively avoid the interference of zero-order diffracted light.The holographic method,which has a small system size and can be combined with nanometer and integrated technology,is expected to realize flat plate holography,which has a broad development prospect.In this paper,based on the modulation principle of surface plasma,the existing static surface plasma holographic imaging results are studied,and a scheme to realize surface plasma dynamic holography is proposed.The feasibility of the theoretical and experimental study of this scheme is analyzed,which provides a theoretical reference for the future research of dynamic holographic imaging.The main research work of this paper is as follows:1)The physical characteristics of surface plasma are studied,and the existing principle of static surface plasma holography is analyzed combined with the traditional holographic theory.2)According to the principle of static surface plasma holography,a dynamic surface plasma holography scheme is proposed.Based on the principle of dynamic regulation of refractive index to achieve dynamic modulation of surface plasmon,the realization of this scheme is explored: based on the holographic structure of static surface plasma,the liquid crystal spatial light modulator is used as the dynamic modulation structure instead of relief structure,and the surface plasma dynamic holographic display is realized by combining the liquid crystal spatial light modulator with the computer generated hologram(CGH).3)According to the principle of surface plasmon modulation,the complex liquid crystal spatial light modulator is decomposed into a simple sinusoidal grating by Fourier transform.Through the rigorous coupled wave analysis method,the parameters of the grating structure are analyzed and calculated,and the relationship between the grating period,thickness and refractive index modulation range for the first-order diffracted light is obtained,and the feasibility of the liquid crystal structure of experimental research is simulated and analyzed.According to the results,the structural parameters are optimized,which is convenient for future experimental research.