Fabrication of three-dimensional proteinaceous micro- and nano-structures by femtosecond laser cross-linking

Antireflection and superhydrophilicity performance are desirable for improving the properties of electronic devices. Here, we experimentally provide a strategy of femtosecond laser preparation to create micro-nanostructures on the graphite surface in an air environment. The modified graphite surface is covered with abundant micro-nano structures, and its average reflectance is measured to be 2.7% in the ultraviolet, visible and near-infrared regions (250 to 2250 nm). The wettability transformation of the surface from hydrophilicity to superhydrophilicity is realized. Besides, graphene oxide (GO) and graphene are proved to be formed on the sample surface. This micro-nanostructuring method, which demonstrates features of high efficiency, high controllability, and hazardous substances zero discharge, exhibits the application for functional surface.

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Mechanisms of three-dimensional structuring of photo-polymers by tightly focussed femtosecond laser pulses

Optics Express ◽

10.1364/oe.18.010209 ◽

2010 ◽

Vol 18 (10) ◽

pp. 10209 ◽

Cited By ~ 151

Author(s):

Mangirdas Malinauskas ◽

Albertas Žukauskas ◽

Gabija Bičkauskaitė ◽

Roaldas Gadonas ◽

Saulius Juodkazis

Keyword(s):

Femtosecond Laser ◽

Three Dimensional ◽

Laser Pulses ◽

Femtosecond Laser Pulses

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Two-photon polymerization nanolithography technology for fabrication of stimulus-responsive micro/nano-structures for biomedical applications

Nanotechnology Reviews ◽

10.1515/ntrev-2020-0073 ◽

2020 ◽

Vol 9 (1) ◽

pp. 1118-1136

Author(s):

Zhenjia Huang ◽

Gary Chi-Pong Tsui ◽

Yu Deng ◽

Chak-Yin Tang

Keyword(s):

Biomedical Applications ◽

Three Dimensional ◽

Water Soluble ◽

Fabrication Technology ◽

Nano Fabrication ◽

Two Photon ◽

Nano Structures ◽

Wide Range ◽

Stimulus Responsive ◽

Two Photon Polymerization

AbstractMicro/nano-fabrication technology via two-photon polymerization (TPP) nanolithography is a powerful and useful manufacturing tool that is capable of generating two dimensional (2D) to three dimensional (3D) arbitrary micro/nano-structures of various materials with a high spatial resolution. This technology has received tremendous interest in cell and tissue engineering and medical microdevices because of its remarkable fabrication capability for sophisticated structures from macro- to nano-scale, which are difficult to be achieved by traditional methods with limited microarchitecture controllability. To fabricate precisely designed 3D micro/nano-structures for biomedical applications via TPP nanolithography, the use of photoinitiators (PIs) and photoresists needs to be considered comprehensively and systematically. In this review, widely used commercially available PIs are first discussed, followed by elucidating synthesis strategies of water-soluble initiators for biomedical applications. In addition to the conventional photoresists, the distinctive properties of customized stimulus-responsive photoresists are discussed. Finally, current limitations and challenges in the material and fabrication aspects and an outlook for future prospects of TPP for biomedical applications based on different biocompatible photosensitive composites are discussed comprehensively. In all, this review provides a basic understanding of TPP technology and important roles of PIs and photoresists for fabricating high-precision stimulus-responsive micro/nano-structures for a wide range of biomedical applications.

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Fabrication of Three-Dimensional Micro-Structures with Two-Photon Absorption by Femtosecond Laser

Materials Science Forum ◽

10.4028/www.scientific.net/msf.532-533.568 ◽

2006 ◽

Vol 532-533 ◽

pp. 568-571

Author(s):

Ming Zhou ◽

Hai Feng Yang ◽

Li Peng Liu ◽

Lan Cai

Keyword(s):

Photonic Crystal ◽

Femtosecond Laser ◽

Detection System ◽

Three Dimensional ◽

Photon Absorption ◽

Micro Fabrication ◽

Two Photon Absorption ◽

Two Photon ◽

Photo Polymerization ◽

System A

The photo-polymerization induced by Two-Photon Absorption (TPA) is tightly confined in the focus because the efficiency of TPA is proportional to the square of intensity. Three-dimensional (3D) micro-fabrication can be achieved by controlling the movement of the focus. Based on this theory, a system for 3D-micro-fabrication with femtosecond laser is proposed. The system consists of a laser system, a microscope system, a real-time detection system and a 3D-movement system, etc. The precision of micro-machining reaches a level down to 700nm linewidth. The line width was inversely proportional to the fabrication speed, but proportional to laser power and NA. The experiment results were simulated, beam waist of 0.413μm and TPA cross section of 2×10-54cm4s was obtained. While we tried to optimize parameters, we also did some research about its applications. With TPA photo-polymerization by means of our experimental system, 3D photonic crystal of wood-pile structure twelve layers and photonic crystal fiber are manufactured. These results proved that the micro-fabrication system of TPA can not only obtain the resolution down to sub-micron level, but also realize real 3D micro-fabrication.

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