Holographic Video Display Device Based On Sub-wavelength Structure

Holographic video display is considered to be one of the most promising three-dimensional display technology can dynamically show the realistic 3D scenes. The holographic video display system is the core device of a spatial light modulator (SLM), relative to other types of SLM, liquid crystal on silicon (LCOS) as a liquid crystal SLM, a high diffraction efficiency, large aperture ratio, and high resolution, is an ideal device current can be obtained. However, in order to holographic video display into practical use, there are some key technologies need to overcome. Space-bandwidth product, for example, LCOS pixel size is reduced to the order of sub-wavelength visible light scale, while ensuring sufficient diffraction efficiency. Recently, with the development of surface plasmon polaritons technology, special sub-wavelength structure to achieve different objectives designed to provide effective light field control means, in particular, phase modulation capability, and thus alleviate the holographic video display devices bottlenecks faced provides a new way of thinking.In this thesis, the phase modulator LCOS device models available for holographic video display based and metallic sub-wavelength effective combination of structure, research based on local surface plasmon polaritons (LSP)-FabryPerot (FP) novel LCOS device models, it is desirable to meet the practical purpose of holographic video display device. The main research work and dissertation are summarized as follows:1) In order to model the structure of the conventional LCOS devices matched to the medium and the surface of metal and nonmetal material interface plasma polariton basic principle is based on the theory of metal-dielectric-metal (MIM) structure of the optical analysis of characteristics. Strict selection of numerical solution of Maxwell equations simulation software FDTD Solutions conducted simulation experiments to verify the MIM structure covered in this article have abnormal reflex mechanism by the LSP and FP resonance coupling formed existence.2) In this thesis, we will be introduced into the metal-based sub-wavelength grating structure for improved LCOS device, LCOS device model is proposed based on the LSP-FP. Specific design idea is:replace the common electrode layer on top of traditional LCOS sub-wavelength metal grating, and then construct a MIM structure formed LSP-FP resonant coupling reflective optical phase modulation mode. Take advantage of localized plasmon resonance coupling environmental sensitivity of the refractive index, the refractive index of the final MIM structure can be changed by a dielectric layer electrically controlled way, while the new device so that the pixel size of the model can achieve sub-wavelength scale. The CST Microwave Studios carried out by means of the corresponding software simulation experiment results show that the device model can be close to the amount of phase modulation, and reflection efficiency from 78% to 92.9%, can satisfy the practical phase holographic display device the amount of modulation and diffraction efficiency demand.