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Method of realizing information display and encryption based on femtosecond laser-induced segmentation patterns

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, to achieve the effect of expanding the range and realizing the encryption of information

Active Publication Date: 2020-03-24
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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  • Method of realizing information display and encryption based on femtosecond laser-induced segmentation patterns
  • Method of realizing information display and encryption based on femtosecond laser-induced segmentation patterns
  • Method of realizing information display and encryption based on femtosecond laser-induced segmentation patterns

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Embodiment 1

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

[0022] 1) 100nm Ti and 20nm Au are sequentially deposited on a glass substrate with an area of ​​2×2cm 2 The metal film is used as the processing object;

[0023] 2) Build the optical path, refer to figure 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 aperture diaphragm 5 in sequence, and finally is focused on the scissor lift table 7 through the two-axis scanning galvanometer system 6. The femtosecond laser 1 and the two-axis scanning galvanometer system 6 are connected to the computer;

[0024] 3) Use computer to adjust the output laser of 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 200μ...

Embodiment 2

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

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

Embodiment 3

[0031] In Example 3, in Example 1, two beams of white light are set to irradiate the divided patterns in the XZ plane and the YZ plane at the same time.

[0032] The beneficial effects of this embodiment are: refer to Figure 5 , in this embodiment, when the incident angles of the two beams of white light are different, a butterfly pattern with a different color from the substrate can be obtained; when the incident angle of the two beams of white light is the same (55°), the butterfly and the substrate containing the butterfly as a whole show a Colors are used to hide the butterfly pattern and encrypt the 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 objects in nature, and the application of color in the field of information has attracted considerable attention in recent years. Physical colors are the selective reflection and transmission of visible light through the microstructure of objects, also known as structural colors. Physical colors not only do not fade, but also very environmentally friendly. [0003] Metals are one of the most widely used materials for making structural colors due to their durability, toughness and flexibility, but only structural colors in reflective mode can be obtained on bulk metal, while reflective and transmissive modes can be obtained on metal films Structural colors below. Compare...

Claims

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Application Information

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Patent Type & Authority Applications(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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