Multifunctional holographic liquid crystal elements based on polarization,wavelength and position multiplexing method
In order to realize holographic display with large information capacity and multi-function,several polarization/position/wavelength multiplexing liquid crystal devices are proposed and verified respectively.First,multiple holograms corresponding to specific diffraction conditions and target images are calculated by GS algorithm.Then,multiple holograms are superimposed with the principle of holographic superposition and the multiplexed hologram based on geometric phase is obtained.Finally,several multiplex liquid crystal devices are fabricated based on liquid crystal photoalignment technology and their effectiveness is verified.Experimental results indicate that this method can be used to design liquid crystal devices that display holographic images with multiple polarizations,positions and wavelengths,and devices based on liquid crystal polymer and plastic substrates can achieve clear image display when bent.In addition,a dynamic holographic liquid crystal cell for wavelength multiplexing is proposed,which has good electrical tunability and realizes the imaging switch of on/off state in the visible light band of 445～638 nm.Benefiting from the flexibility of the holographic superposition mechanism and the properties of liquid crystal materials,our strategy provides a new perspective for low-cost multi-channel holographic liquid crystal devices,and the designed liquid crystal based multiplexing devices have broad potential in flexible display,imaging multiplexing and information storage.
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