scholarly journals A Ripple Microstructure Formation on a Uniform-melted Material Surface by Nanosecond Laser Pulses

2011 ◽  
Vol 22 ◽  
pp. 442-448 ◽  
Author(s):  
Yongguang Huang ◽  
Shibing Liu ◽  
Hongliang Zhu
Keyword(s):  
Laser Pulses ◽  
Material Surface ◽  
Nanosecond Laser ◽  
Microstructure Formation ◽  
Nanosecond Laser Pulses ◽  
Melted Material

Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

2010 ◽  
Vol 97-101 ◽  
pp. 3803-3806
Author(s):  
Yong Xiang Hu ◽  
Heng Zhang ◽  
Zheng Qiang Yao
Keyword(s):  
Cost Effective ◽  
Laser Pulses ◽  
Laser Beams ◽  
Nanosecond Laser ◽  
Effective Technique ◽  
First Order ◽  
Direct Fabrication ◽  
Cost Effective Technique ◽  
Nanosecond Laser Pulses ◽  
Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

scholarly journals Creation of Superhydrophobic and Superhydrophilic Surfaces on ABS Employing a Nanosecond Laser

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2547 ◽  
Author(s):  
Cristian Lavieja ◽  
Luis Oriol ◽  
José-Ignacio Peña
Keyword(s):  
Acrylonitrile Butadiene Styrene ◽  
Laser Pulses ◽  
Green Laser ◽  
Contact Angles ◽  
Material Surface ◽  
Nanosecond Laser ◽  
Focal Position ◽  
Superhydrophilic Surface ◽  
Wetting Behaviors ◽  
Superhydrophilic Surfaces

A nanosecond green laser was employed to obtain both superhydrophobic and superhydrophilic surfaces on a white commercial acrylonitrile-butadiene-styrene copolymer (ABS). These wetting behaviors were directly related to a laser-induced superficial modification. A predefined pattern was not produced by the laser, rather, the entire surface was covered with laser pulses at 1200 DPI by placing the sample at different positions along the focal axis. The changes were related to the laser fluence used in each case. The highest fluence, on the focal position, induced a drastic heating of the material surface, and this enabled the melted material to flow, thus leading to an almost flat superhydrophilic surface. By contrast, the use of a lower fluence by placing the sample 0.8 µm out of the focal position led to a poor material flow and a fast cooling that froze in a rugged superhydrophobic surface. Contact angles higher than 150° and roll angles of less than 10° were obtained. These wetting behaviors were stable over time.

scholarly journals Laser Formation of Periodic Micro- and Nanostructures on the Surface of Monocrystalline Silicon

2020 ◽  
Vol 21 (2) ◽  
pp. 215-218
Author(s):  
I. A. Mohylyak ◽  
O. Yu. Bonchyk ◽  
S. A. Korniy ◽  
S. G. Kiyak ◽  
D. I. Popovych
Keyword(s):  
Periodic Structures ◽  
Experimental Studies ◽  
Laser Pulses ◽  
Pulse Mode ◽  
Semiconductor Surface ◽  
Nanosecond Laser ◽  
Periodic Nanostructures ◽  
Nanosecond Laser Pulses ◽  
Electron Microscopes ◽  
Microscopic Investigations

Experimental studies of the features of the formation of laser-induced periodic nanostructures on the surface of silicon wafers in the zones of action of second, millisecond and nanosecond laser pulses are conducted in the work. The results of microscopic investigations by optical and electron microscopes of periodic structures formed on surfaces with crystallographic orientation (111), (100) are presented. The obtained results can be used to optimize the laser pulse mode for controlled micro- nanostructuring of the semiconductor surface.

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