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Method for preparing two-dimensional periodic metal particle array structure through dual-wavelength femtosecond lasers

A femtosecond laser, two-dimensional period technology, applied in laser welding equipment, metal processing equipment, welding equipment and other directions, can solve the problems of complex optical path design and working device, and the influence of two-dimensional structure space period, so as to achieve low cost and high efficiency High and operability effects

Inactive Publication Date: 2014-06-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these experimental methods mainly involve multi-beam interference of a single wavelength, the actual optical path design and working device are relatively complicated, and the spatial period of the two-dimensional structure formed will also be affected by the precise adjustment of the interference optical path

Method used

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  • Method for preparing two-dimensional periodic metal particle array structure through dual-wavelength femtosecond lasers
  • Method for preparing two-dimensional periodic metal particle array structure through dual-wavelength femtosecond lasers
  • Method for preparing two-dimensional periodic metal particle array structure through dual-wavelength femtosecond lasers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as figure 1 As shown in the optical path structure, after the femtosecond laser 2 generated by the femtosecond laser 1 is incident on the total reflection mirror 3, its reflected light is irradiated vertically to the surface of the BBO frequency doubling crystal 5 through the neutral attenuator 4, and then the dual-wavelength femtosecond laser generated 6 passes through the dichroic mirror 7 and enters the focusing element 8, and the focused two-color femtosecond laser irradiates the surface of the metal target sample 9 fixed on the three-dimensional precision mobile platform 10 to induce the formation of a two-dimensional periodic distribution of submicron particle arrays structure.

[0052] Among them, the laser pulse output from the femtosecond laser has the following characteristic parameters: a repetition frequency of 1000 Hz, a pulse width of 50 femtoseconds, a center wavelength of 800 nanometers, and horizontal linear polarization. After passing through the...

Embodiment 2

[0054] Such as figure 2 As shown in the optical path structure, the femtosecond laser 2 generated by the femtosecond laser 1 passes through the beam splitter 11 to form two laser pulses, and then enters two different optical paths respectively, and the femtosecond laser in the optical path of one arm is only neutrally attenuated Sheet 4 reaches the dichroic mirror 7, and the femtosecond laser in the other arm of the optical path enters the adjustable time delay line 12 after passing through the total reflection mirror 3 and the neutral attenuation sheet 4, and then vertically irradiates the BBO frequency doubling crystal after a time delay 5, and then reach the dichroic mirror 7 through the optical filter 13, and the two laser beams are respectively transmitted and reflected by the dichroic mirror 7 to become a collinearly transmitted dual-wavelength femtosecond laser pulse, which is focused by the optical element 8 The surface of the metal target sample 9 fixed on the three-...

Embodiment 3

[0057] On the basis of the optical path in Example 1, a neutral attenuator is used to attenuate the fundamental frequency femtosecond laser power incident on the BBO crystal, and the azimuth angle of the BBO crystal is rotated to obtain the maximum frequency doubling efficiency, that is, the crystal o The axis is parallel to the polarization direction of the incident fundamental-frequency laser, so that the remaining 800-nm laser output afterwards maintains the original linear polarization, while the 400-nm frequency-doubled laser is also linearly polarized, and the polarization directions of the two are perpendicular to each other. The total power of the dual-wavelength femtosecond laser after reflection by the dichroic mirror is 2 milliwatts, and the sample surface is placed at a position 400 microns in front of the laser focus. image 3Shown are scanning electron micrographs of the processing effect obtained when the sample scanning speed is 0.04 mm / s, and the magnifications...

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Abstract

The invention provides a method for preparing a two-dimensional periodic metal particle array structure through dual-wavelength femtosecond lasers. The method and an implementation device for preparing the two-dimensional periodic particle array structure on the surface of metal by focusing two-color femtosecond laser pulses are provided. The method and the implementation device are characterized in that the metal particle structure is distributed in the two-dimensional direction in a periodic submicron dimension mode; two-color femtosecond lasers with different characteristic parameters are collinearly focused and irradiated on a sample after common channel or branch channel time delay through a nonlinear frequency doubling technology, and formed two-dimensional periodic structure patterns can be effectively adjusted and controlled by changing the azimuth angle of frequency doubling crystals and the power ratio of the two-color lasers. The method has the advantages that through the combinational design of different wavelengths and the polarization property of the femtosecond lasers, the submicron dimension two-dimensional periodic metal particle array structure can be conveniently and quickly prepared. The novel method for preparing the structure through the two-color femtosecond lasers has potential and important application value in the field of material micro-nano processing.

Description

Technical field: [0001] The invention relates to a method and a processing device for preparing a two-dimensional periodic submicron-scale particle array structure on the surface of a metal material with a femtosecond laser. The femtosecond laser pulse is used to induce a periodic subwavelength stripe structure on the metal surface that varies with the incident laser wavelength and polarization state. The changing physical effect belongs to the field of ultrafast laser application and micro-nano processing. In the future, it may have important potential applications in the design and preparation of new nanophotonic devices related to surface plasmon polaritons---SPPs. . Background technique: [0002] In recent years, the rapid development and maturity of femtosecond laser technology and its commercial devices have attracted extensive attention from researchers in many disciplines, especially due to the short pulse time, high peak power and focused power density of femtosecon...

Claims

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Application Information

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IPC IPC(8): B23K26/08B23K26/06B23K26/36B23K26/40B23K26/362B23K26/60B23K26/046
CPCB23K26/0643B23K26/067B23K26/352B23K26/36B23K26/60
Inventor 杨建军丛佳赵波周剑雄黄智林朱晓农
Owner NANKAI UNIV
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