Metasurface color holography preparation method and optical system

Abstract

The invention relates to a metasurface color holography preparation method, which comprises the following steps of on the basis of a pixel structure or pixel distribution, respectively layering and extracting a color target object image to obtain the corresponding multiple image layers; respectively obtaining a micro-nano structure and a micro-nano structure combination corresponding to each imagelayer, and obtaining a change relationship between the micro-nano structures and the micro-nano structure combinations among the layers; according to the combination of the micro-nano structure and aprimary color micro-nano structure of any image layer, realizing the simultaneous preparation of intra-layer multiple pixel micro-nano structures of the image layer by utilizing photoetching of spaceor / and phase modulation; and according to the change relationship of the micro-nano structures and the micro-nano structure combinations among the layers, realizing the simultaneous preparation of the micro-nano structures and the micro-nano structure combinations of the rest layers in a time-sharing manner by utilizing space or / and phase real-time regulation and control. According to the invention, the simultaneous preparation of multiple pixel micro-nano structures and the time-sharing preparation of the layered pixel combinations are realized, so that the large-format rapid preparation ofcolor holography can be realized.

Description

technical field [0001] The invention belongs to the technical field of color holographic imaging systems, and in particular relates to a method for preparing a supersurface color hologram and an optical system. Background technique [0002] Color holography is a method of digitally modulating and filtering the color separation hologram in the frequency domain by a computer to reproduce the object with the corresponding primary color light, and obtain the original true color object image after synthesis, and the obtained reproduction image can be very good Solve the problem of color crosstalk effectively and eliminate the influence of zero order and conjugate image. [0003] Due to the unique optical properties of functional materials with micro-nano structures, they have important research significance and application value in the fields of energy, new materials, and sensing. Therefore, methods for preparing such micro-nano structures emerge in endlessly. Commonly used meth...

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Problems solved by technology

However, usually the spatial frequency of the structured light field output by the interference lithography system is fixed, and the structures are mainly periodic structures such as gratings and lattices, which cannot achieve real-time output of variable parameter pattern structures.

For example, the Institute of Microelectronics and Mechanics of National Taiwan University and AHEAD Light Spot Co., Ltd. jointly developed the Sparkle system, which uses a beam splitter and mirror splitting system. By changing the position of the lens, the two beams of light can form different sizes of focus on the photoresist plate. point, and rotating the entire optical prism group around the axis can change the orientation of the grating, and moving the two mirrors up and down can change the space frequency of the grating point, but its mechanical movement mechanism is complicated, which is not conducive to the stability of the optical path

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