Method for preparing two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing

A metal photonic crystal and femtosecond laser technology, applied in laser welding equipment, metal processing equipment, welding equipment, etc., can solve the problems of complex preparation process, long process time, structural style and processing area limitation, etc. Simple, low cost, high efficiency effect

Inactive Publication Date: 2015-12-02
NANKAI UNIV
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  • Application Information

AI Technical Summary

Benefits of technology

This technology described in this patents allows for easy creation of complex structures called quantum dots (QDS) within materials like metals without requiring multiple steps or expensive equipment. It involves combining specific types of light waves together into an interference pattern inside a special type of glass substrate. By controllably adjusting these waveforms' properties, it becomes possible to control how they behave when exposed onto certain surfaces during processing. Overall, QDL provides improved performance compared to existing techniques used traditionally.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving nanoscale metrology technologies through generating stable gratings called quantum dots or nanospherulatronbs without affecting the surrounding medium'spatial configuration during manufacturing processes. Existing methods involve complex steps like multiple pump excitation sources, lenses, mirror systems, scanning electron microscope techniques, atomic force scattering technique, phase locked loop type optomechanisms, and electrostatic reflection holographic imaging.

Method used

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  • Method for preparing two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing
  • Method for preparing two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing
  • Method for preparing two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing

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Experimental program
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Embodiment 1

[0042] Such as figure 1 As shown, the horizontally linearly polarized laser 2 output from the femtosecond laser amplifier 1 with a repetition frequency of 1000 Hz, a pulse width of 50 femtoseconds, and a center wavelength of 800 nanometers is vertically incident on a YVO with a thickness of 1.26 mm after passing through a neutral attenuator 4 On the optical birefringent crystal 3, each incident pulse will be converted into two femtosecond laser pulses with the same central wavelength but the polarization directions are perpendicular to each other after exiting the crystal, wherein the polarization directions of the two beams are determined by the azimuth angle of the crystal It is determined that they are colinearly transmitted in space and the beam is focused by the same plano-convex cylindrical lens 4. By controlling the three-dimensional precision mobile platform 6, the surface of the sample material 5 to be processed is moved to a distance of 0-300 microns in front of the ...

Embodiment 2

[0044] On the basis of the light path in embodiment 1, adopt neutral attenuation sheet to be incident to YVO 4 The femtosecond laser power on the crystal is attenuated and the YVO 4 The azimuth rotation of the crystal is adjusted to 49° to obtain a double-pulse femtosecond laser beam with output linear polarization directions perpendicular to each other and a central wavelength of 800 nanometers. Before they are incident on the plano-convex cylindrical lens, the measured total laser power is 180 mW, and the sample target surface is adjusted to the focal point of the lens. figure 2 Shown are scanning electron micrographs of microstructures obtained on the sample surface when the sample scanning speed is 0.02 mm / s, and the magnifications are 10,000 and 50,000 times, respectively. It can be seen from the figure that at this time, the surface of the sample forms a dot-like structure distributed in a two-dimensional periodic array, and the corresponding spatial period and cell di...

Embodiment 3

[0046] In the operation of Example 2, the width of the scribe line was increased to 0.15 mm to obtain a dot-shaped microstructure distributed in a two-dimensional periodic array within a large area. image 3 It is a scanning electron micrograph at 5000 times magnification.

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Abstract

Provided is a method for preparing a two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing. The invention provides a method and experiment device for preparing the periodically-distributed two-dimensional photonic crystal structure with the feature size being the sub-micron dimension in one step in the large area by focusing identical-wavelength double-pulse femtosecond laser on the surface of metal through a plano-convex cylindrical lens, and the identical-wavelength double-pulse femtosecond laser is obtained based on the spectrophotometry of birefringent crystals and has the features of collinear transmission, cross polarization and picosecond time delay. Two-dimensional periodic structure patterns can be effectively regulated and controlled by changing the energy and the number of pulses of input laser, the thicknesses and the azimuth angles of the birefringent crystals and the like. Through the combined design of different linear polarization directions and the variable time delay feature of two femtosecond laser pulses and focusing of the cylindrical lens, preparation of the two-dimensional metallic photonic crystal structure within the large area is achieved conveniently and quickly. The novel preparation method adopting the double-pulse femtosecond laser with cross polarization and variable time delay has potential important applications in the field of material micro-nano processing and preparation.

Description

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Claims

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Application Information

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Owner NANKAI UNIV
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