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Method and system for processing nanocone arrays on silk film using femtosecond laser

A femtosecond laser and nanocone technology, which is applied in the field of femtosecond laser application, can solve the problem of lack of processing nanoscale cone-shaped convex arrays.

Active Publication Date: 2020-10-27
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is still a lack of a method to flexibly fabricate nanoscale cone-shaped protrusion arrays on silk films in an atmospheric environment

Method used

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  • Method and system for processing nanocone arrays on silk film using femtosecond laser

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Adjust the neutral density attenuator 2, and set the energy flux of a single pulse to 6.2J / cm 2 , the moving speed of the translation stage is 800 μm / s, and the scanning interval is 800 nm, and a nanocone array with a diameter of 210 nm, a height of 17.55 nm, and a pitch of 800 nm is obtained on the silk film 6 .

Embodiment 2

[0055] Adjust the neutral density attenuator 2, and set the energy flux of a single pulse to 7J / cm 2 , the moving speed of the translation stage is 1000 μm / s, the scanning interval is 1000 nm, and a nanocone array with a diameter of 320 nm, a height of 44.4 nm, and a pitch of 1000 nm is obtained on the silk film 6 .

Embodiment 3

[0057] Adjust the neutral density attenuator 2 and set the energy flux of a single pulse to 7.7J / cm 2 , the moving speed of the translation stage is 1500 μm / s, the scanning interval is 1500 nm, and a nanocone array with a diameter of 420 nm, a height of 168 nm, and a pitch of 1500 nm is obtained on the silk film 6 .

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Abstract

The invention relates to a method and system for processing a nano-cone array on a silk film by utilizing femtosecond laser, and belongs to the technical field of femtosecond laser application. The method comprises the steps that firstly, the silk film is prepared through a chemical method, then a single femtosecond laser pulse is focused on the surface of the silk film through a microscope objective lens, and a nano-cone structure with the diameter of 200-500 nm and the height of 17-170 nm is obtained by regulating the energy flux incident on the surface of the silk film. According to the method and the system, under the irradiation of the femtosecond laser pulse sequence, the silk film is continuously moved through an electronic control translation stage, and therefore the preparation ofthe nano-cone array with the pitch of 600-1500 nm is realized. The method is based on the multi-photon absorption expansion effect of silk fibroin on the femtosecond laser, and therefore the nano-cone array far smaller than the diffraction limit is processed on the surface of the silk film. The system and the method have the advantages of being high in precision, high in flexibility, contactless,maskless and capable of being conducted in an atmospheric environment, and a feasible method is provided for preparing a biological photoelectric device.

Description

technical field [0001] The invention relates to a method and system for processing a nanocone array on a silk film by using a femtosecond laser, and belongs to the technical field of femtosecond laser application. Background technique [0002] With the development of biomedical technology, the demand for biocompatible sensors and optoelectronic devices is becoming more and more urgent. Silk is a natural protein fiber, which is expected to be a bridge connecting the biological world and the optoelectronic world due to its special structural form, excellent mechanical properties, optical properties, good biocompatibility and biodegradability. At present, it is common to use chemical methods to transform silk into transparent films or bulk materials. Further use nano-imprinting, nano-casting, soft etching, electron beam irradiation and other micro-nano processing methods to prepare different micro-nano structures on the surface of silk films, thus obtaining holographic grating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/00B23K26/352B82Y15/00B82Y40/00
CPCB23K26/00B82Y15/00B82Y40/00B23K26/352
Inventor 姜澜乔明闫剑锋
Owner TSINGHUA UNIV
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