A Method of Realizing Information Display and Encryption Based on Femtosecond Laser Induced Segmentation Pattern

An information display, femtosecond laser technology, applied in laser welding equipment, metal processing equipment, welding equipment and other directions, can solve the problem of small pattern display range

Active Publication Date: 2021-01-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The observation of structural color depends on the incident angle of the light source and the direction angle of the corrugation, but when the incident angle of the light source is constant, the obtained pattern display is related to the direction angle of the corrugation, so the pattern can only be observed within a certain range, and the pattern display range is small

Method used

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  • A Method of Realizing Information Display and Encryption Based on Femtosecond Laser Induced Segmentation Pattern
  • A Method of Realizing Information Display and Encryption Based on Femtosecond Laser Induced Segmentation Pattern
  • A Method of Realizing Information Display and Encryption Based on Femtosecond Laser Induced Segmentation Pattern

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Embodiment 1

[0021]Embodiment 1, a method for realizing information display and encryption based on femtosecond laser-induced segmentation patterns, including the following steps:

[0022]1) Using 100nm Ti and 20nm Au deposited sequentially on a glass substrate, the area is 2×2cm2Metal film as the processing object;

[0023]2) Build light path, refer tofigure 1 , The output light of the femtosecond laser 1 passes through the half-wave plate 2, the Glan-Taylor prism 3, the beam expander 4 and the small aperture diaphragm 5 in turn, and finally is focused on the scissor lift table 7 through the two-axis scanning galvanometer system 6. The described femtosecond laser 1 and the two-axis scanning galvanometer system 6 are connected to a computer;

[0024]3) Use a computer to adjust the output laser of the femtosecond laser 1. The laser wavelength is 1030nm, the pulse width is 240fs, the repetition frequency is adjustable from 1-200kHz, and the maximum single pulse energy is 200μJ;

[0025]4) Fix the sample on th...

Embodiment 2

[0029]In Example 2, the white light irradiation direction in Example 1 was set in the YZ plane.

[0030]The beneficial effects of this embodiment are as follows:Figure 4 In this embodiment, it can be seen that the segmentation of the pattern does not affect the recognition of butterfly information, and as the incident angle of white light decreases from 55° to 30°, the color of the butterfly changes from red to blue. At this time, changing the wave direction angle, the display range of the pattern color is also about 30°; therefore, when the sample is rotated 180°, the display range of the butterfly is approximately doubled.

Embodiment 3

[0031]In Example 3, Example 1 was set to irradiate the divided patterns in the XZ plane and the YZ plane with two beams of white light simultaneously.

[0032]The beneficial effects of this embodiment are as follows:Figure 5In this embodiment, when the incident angles of the two white lights are different, a butterfly pattern with a different color from the base can be obtained; when the incident angles of the two white lights are the same (55°), the butterfly and the base including the butterfly appear as a whole Various colors are used to hide the butterfly pattern and realize the encryption of information.

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Abstract

The invention discloses a method of realizing information display and encryption based on femtosecond laser-induced segmentation patterns. The method comprises the following steps: firstly, a metal film on which Ti and Au are sequentially deposited on a glass substrate is taken as a processing object; secondly, a light path is built, and a computer is used to adjust a femtosecond laser device to output laser, wherein the laser wavelength is 1030 nm, the pulse width is 240 fs, the repetition frequency is adjustable within 1-200 kHz, and the maximum monopulse energy is 200 muJ; a sample is thenfixed on a processing station of a shear type lifting platform, the laser energy, a scanning speed and a scanning distance are adjusted, the pattern is equally segmented by 100 mum, and respectively laser-induced periodic surface structures LIPSSs of which the directions are vertical to each other are prepared in the segmented adjacent areas. According to the method, the LIPSSs perpendicular to each other in directions are prepared in the adjacent areas of the segmented pattern through femtosecond laser induction, the information display range is expanded, and information encryption is achieved.

Description

Technical field[0001]The invention belongs to the technical field of laser pattern manufacturing, and particularly relates to a method for realizing information display and encryption based on a femtosecond laser-induced segmentation pattern.Background technique[0002]Color is an important feature of natural objects. In recent years, the application of color in the field of information has attracted considerable attention. Physical color is the selective reflection and transmission of visible light through the microstructure of an object, and is also called structural color. The physical color will not fade, and it is very environmentally friendly.[0003]Metal is one of the most widely used materials for manufacturing structural colors due to its durability, toughness and flexibility. However, only the structural color in the reflective mode can be obtained on the metal block, while the reflective mode and the transmission mode can be obtained on the metal film. Structure color under....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/00B23K26/362
CPCB23K26/00B23K26/362
Inventor 王文君孙小云梅雪松张祎霖崔健磊
Owner XI AN JIAOTONG UNIV
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