Design method of metasurface color nanoprinting devices for reconfigurable watermarking

Abstract

The invention provides a method for designing a metasurface color nano-printing device that realizes reconfigurable watermarks, including: constructing a metasurface array; optimizing and simulating to obtain reflection spectra of nano-brick structural units with multiple sets of size parameters, and calculating their structural color ; Design the target color image, select several groups of size parameters whose structural color meets the requirements according to the color distribution of the target color image as the candidate size parameters; The size parameters corresponding to the nano-brick structural unit; design the watermark image to be superimposed, on the basis of the above steps, set the nano-brick steering angle of the nano-brick structural unit corresponding to the superimposed pixel without watermark to α, and set the superimposed pixel of the watermark to α The nanobrick steering angle of the corresponding nanobrick structural unit is set to α±90°. The invention has high processing error tolerance, reduces design and processing difficulty, and has good development prospects.

Description

technical field [0001] The invention belongs to the technical field of micro-nano optics, and in particular relates to a design method of a super-surface color nano-printing device for realizing a reconfigurable watermark. Background technique [0002] The current structural color nanoprinting scheme based on polarization multiplexing usually adjusts the spectral response of polarized light in two orthogonal directions by designing the long and short axis dimensions of the nanounit structure. However, in this type of scheme, when the long-axis or short-axis size of the nanounit is changed independently, the transmission and reflection spectra of polarized light in both directions will be affected, and the spectral response of polarized light in a certain direction cannot be independently adjusted. The design and processing of multiplex structured color nanoprinting schemes are difficult. Contents of the invention [0003] The purpose of the present invention is to address...

AI Technical Summary

Problems solved by technology

However, in this type of scheme, when the long-axis or short-axis size of the nanounit is changed independently, the transmission and reflection spectra of polarized light in both directions will be affected, and the spectral response of polarized light in a certain direction cannot be independently adjusted. The design and processing of multiplex structured color nano-printing schemes are difficult

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