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CN-116381932-B - Triple optical information multiplexing method based on polarization modulation plasmon super surface

CN116381932BCN 116381932 BCN116381932 BCN 116381932BCN-116381932-B

Abstract

The invention discloses a triple optical information multiplexing method based on polarization modulation plasmon super-surface, which comprises the steps of firstly constructing a structural unit formed by arranging modules along three different directions for forming the super-surface, optimizing the sizes of the modules in the structural unit, enabling the module structure to generate spectral responses to incident linearly polarized light along a certain direction, enabling the spectral positions to be respectively positioned in blue, green and red wavebands, enabling the incident linearly polarized light polarized in the vertical direction to have no structural color response, constructing three information channels along the three directions based on the optimized super-surface, converting binary information of binary patterns of three different colors into selection of module designs in the structural unit, realizing reading of the three channels and displaying three different images by changing the polarization angles of the linearly polarized light incident on the super-surface. The invention improves the information storage capacity of the super surface, and the information loading and reading modes are simple and convenient.

Inventors

  • Huo Dewang
  • LI GUOQIANG

Assignees

  • 之江实验室

Dates

Publication Date
20260508
Application Date
20230301

Claims (8)

  1. 1. The triple optical information multiplexing method based on the polarization modulation plasmon super surface is characterized by comprising a substrate and square periodically arranged structural units positioned on the substrate, wherein each structural unit comprises three micro-nano structural modules, and long axes of the three micro-nano structural modules are respectively placed along 0 DEG, 60 DEG and 120 DEG; the triple optical information multiplexing method comprises the following steps: calculating optical response of a structural unit by adopting an electromagnetic simulation tool, setting a working wavelength range, and optimizing dimensional parameters of three micro-nano structure modules in the structural unit so that spectral response positions of the three micro-nano structure modules are respectively positioned in blue, green and red wave bands, thereby constructing three information channels along three directions; step two, designing blue, green and red binary patterns, converting binary information into all or part of micro-nano structure modules in the structural unit, and selecting all or part of the micro-nano structure modules to realize that three information channels respectively display a pair of binary patterns with different colors, thereby completing the design and construction of the super surface; And thirdly, reading three information channels based on the polarization modulation plasmon super surface by changing the polarization angle of the incident ray polarized light, and displaying three different images.
  2. 2. The method for multiplexing triple optical information based on polarization modulating plasmon super surface according to claim 1, wherein said step one specifically comprises the following sub-steps: (1.1) arranging square periodically arranged structural units on a substrate, wherein the vertex of one structural unit is used as an origin, and two directions of the square period are respectively an x axis and a y axis; The method comprises the steps of (1.2) arranging a micro-nano structure module with the placement direction of 0 DEG in each structure unit, respectively, normally incident linearly polarized light polarized in the 0 DEG direction and linearly polarized light polarized in the 90 DEG direction from the upper side of the micro-nano structure module, so that the micro-nano structure module generates spectral response to the linearly polarized light, and obtains the wave bands where the spectral positions of the two linearly polarized lights are located; similarly, arranging a micro-nano structure module with the placement direction of 60 degrees in each structure unit, and respectively vertically incident linearly polarized light polarized along the 60 degrees direction and linearly polarized light polarized along the 150 degrees direction from the upper part of the micro-nano structure module to enable the micro-nano structure module to generate spectral response to the linearly polarized light and acquire a wave band where the spectral positions of the two linearly polarized light are located; Similarly, a micro-nano structure module with the placement direction of 120 degrees is arranged in each structure unit, linear polarized light polarized along the 120 degrees and linear polarized light polarized along the 30 degrees are respectively and normally incident from above the micro-nano structure module, so that the micro-nano structure module generates spectral response to the linear polarized light, the spectral positions of the two linear polarized light are obtained, the size of the micro-nano structure module is adjusted to simultaneously meet the requirements that (1) the reflection spectral position of the linear polarized light polarized along the 120 degrees is located in a wave band of the other three primary colors different from the reflection spectral position of the micro-nano structure module with the placement direction of 0 degrees and 60 degrees, and (2) the micro-nano structure module has no structural color response to the incident linear polarized light polarized along the 30 degrees.
  3. 3. The method for multiplexing ternary optical information based on the polarization-modulating plasmon super surface according to claim 1, wherein in the second step, binary patterns of blue, green and red are designed, and binary information thereof is converted into rules for selecting all or part of micro-nano structural modules in the structural unit as follows: When the structural unit does not contain the micro-nano structural module with the parallel long axis and the polarizer angle, the structural unit does not display the corresponding structural color, namely, the corresponding structural color is assigned with 0; thereby constructing the corresponding relation between the pixel information in the binary image and whether the corresponding micro-nano structure module is contained in the structural unit.
  4. 4. The triple optical information multiplexing method based on the polarization modulation plasmon super surface according to claim 1, wherein the micro-nano structure module is of a three-layer structure and comprises a metal layer, a dielectric layer and a metal layer from top to bottom.
  5. 5. The polarization-modulating plasmon super surface-based triple optical information multiplexing method of claim 1 wherein said micro-nano structural module is a cuboid.
  6. 6. The polarization-modulating plasmonic super surface based triple optical information multiplexing method of claim 1, wherein the substrate is composed of an optically transparent dielectric material.
  7. 7. The triple optical information multiplexing method based on the polarization modulation plasmon super surface according to claim 4, wherein the material of the metal layer is selected from materials with good plasmon response in a visible light band including aluminum, gold and silver, and the material of the dielectric layer is selected from any one of silicon dioxide, aluminum oxide and magnesium fluoride.
  8. 8. The polarization-modulating plasmon-super-surface-based triple optical information multiplexing method of claim 1, wherein the polarization-modulating-plasmon-super-surface-based working mode is either reflective or transmissive.

Description

Triple optical information multiplexing method based on polarization modulation plasmon super surface Technical Field The invention relates to the field of micro-nano optics, in particular to a triple optical information multiplexing method based on polarization modulation plasmon super surface. Background The optical super-surface device realizes the regulation and control of the light wave by utilizing the interaction of the micro-nano structure and the incident light wave, and can realize various optical regulation and control devices, such as the regulation and control of the reflection, transmission intensity and phase of the light wave by structural design. The optical super-surface device is composed of sub-wavelength structural units and has the advantages of small feature size and high spatial resolution. Among them, the super surface structure color device has been widely studied because of its advantages of little fading, high spatial resolution, environmental friendliness, etc. The super surface structure color printing can realize high-density optical information storage, and the polarization dependent super surface structure color device can realize multiple optical information storage on the same optical device. Most of the existing polarization modulation super-surface structure color devices use mutually perpendicular modules as super-surface structural units, the two mutually perpendicular modules have different dimensional parameters, or different array structures with different periods in the mutually perpendicular directions are used for realizing different optical responses to light waves, so that the super-surface device can only realize storage of two kinds of optical information, the information multiplexing quantity is small, the color gamut range is small, and most super-surface structure color devices can only work in a single reflection or transmission mode. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a triple optical information multiplexing method based on a polarization modulation plasmon super surface, and optical information can be independently stored in three channels by skillfully designing a polarization modulation plasmon super surface structure color device, so that the multiplexing of the triple optical information is successfully realized, and the reading under the reflection and transmission modes is simultaneously realized. The aim of the invention is achieved by the following technical scheme: The polarization modulation plasmon super surface comprises a substrate and square periodically arranged structural units positioned on the substrate, each structural unit comprises three micro-nano structural modules, and long axes of the three micro-nano structural modules are respectively placed along 0 DEG, 60 DEG and 120 DEG; the triple optical information multiplexing method comprises the following steps: calculating optical response of a structural unit by adopting an electromagnetic simulation tool, setting a working wavelength range, and optimizing dimensional parameters of three micro-nano structure modules in the structural unit so that spectral response positions of the three micro-nano structure modules are respectively positioned in blue, green and red wave bands, thereby constructing three information channels along three directions; step two, designing blue, green and red binary patterns, converting binary information into all or part of micro-nano structure modules in the structural unit, and selecting all or part of the micro-nano structure modules to realize that three information channels respectively display a pair of binary patterns with different colors, thereby completing the design and construction of the super surface; And thirdly, reading three information channels based on the polarization modulation plasmon super surface by changing the polarization angle of the incident ray polarized light, and displaying three different images. Further, the first step specifically comprises the following sub-steps: (1.1) arranging square periodically arranged structural units on a substrate, wherein the vertex of one structural unit is used as an origin, and two directions of the square period are respectively an x axis and a y axis; The method comprises the steps of (1.2) arranging a micro-nano structure module with the placement direction of 0 DEG in each structure unit, respectively, normally incident linearly polarized light polarized in the 0 DEG direction and linearly polarized light polarized in the 90 DEG direction from the upper side of the micro-nano structure module, so that the micro-nano structure module generates spectral response to the linearly polarized light, and obtains the wave bands where the spectral positions of the two linearly polarized lights are located; similarly, arranging a micro-nano structure module with the placement direction of 60 degrees in each structure unit, and respectively vert