Computer-generated holography (CGH) is one of promising technologies in wavefront engineering, and multiplexing holography brings more information channels. Inspired by code division multiplexing (CDM) in communications, CDM holography demonstrate its feasibility to recording independent images with high-density in a single hologram. Here, we design CDM holograms with nonorthogonal coded beams as illumination light to record the optical information of both binary and gray-level target images. The results exhibit that optimization in CDM holography ensures a low-level cross talk between each channel. Also, it is difficult for eavesdroppers to decode any information of coded illuminations. Such a large number of information channels and its outstanding features can offer high security for optical data.
Optical metasurfaces are optical elements with artificial subwavelength nanostructures, and it can achieve functions that cannot be realized by traditional optical elements. Combining holography and metasurface boosts performance of light controlling and expanding the application scenario. Here, we will report our works on the methods of holographic multiplexing and realized plenty of channels for information reconstruction, including code division multiplexing method (CDM) for metasurface holography for optical information projection, and a multiplexing optimization method for independent light field manipulation in diffraction orders of metasurface holography. All these methods have bright potential to be applied in fields of optics.
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