Multi-scale micro-nano structures prepared by laser cleaning assisted laser ablation for broadband ultralow reflectivity silicon surfaces in ambient air

2020 ◽  
Vol 509 ◽  
pp. 145182 ◽  
Author(s):  
Tong Chen ◽  
Wenjun Wang ◽  
Tao Tao ◽  
Aifei Pan ◽  
Xuesong Mei
Keyword(s):  
Laser Ablation ◽  
Ambient Air ◽  
Laser Cleaning ◽  
Silicon Surfaces ◽  
Multi Scale ◽  
Nano Structures

scholarly journals Study of the formation of 3-D titania nanofibrous structure by MHz femtosecond laser in ambient air

2021 ◽  
Author(s):  
Amirhossein Tavangar ◽  
Bo Tan ◽  
Krishnan Venkatakrishnan
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Deposition Rate ◽  
Femtosecond Laser Ablation ◽  
Ambient Air ◽  
Experimental Results ◽  
Laser Parameters ◽  
Nanofibrous Structure ◽  
Titania Nanostructures ◽  
Multiple Pulses

In this study, we describe the formation mechanism of web-like three-dimensional (3-D) titania nanofibrous structures during femtosecond laser ablation of titanium (Ti) targets in the presence of background air. First, we demonstrate the mechanism of ablation of Ti targets by multiple femtosecond laser pulses at ambient air in an explicit analytical form. The formulas for evaporation rates and the number of ablated particles, which is analogous to the deposition rate of the synthesized nanofibers, for the ablation by a single pulse and multiple pulses as a function of laser parameters, background gas, and material properties are predicted and compared to experimental results. Afterwards, the formation of nanofibrous structures is demonstrated by applying an existing simplified kinetic model to Ti targets and ambient conditions. The predicted theory provides nanofiber diameter dependency with the combination of laser parameters, target properties, and ambient gas characteristics. Experimental studies are then performed on titania nanofibrous structures synthesized by laser ablation of Ti targets using MHz repletion-rate femtosecond laser at ambient air. The models' predictions are then compared with the experimental results, where nanostructures with different morphologies are manufactured by altering laser parameters. Our results indicate that femtosecond laser ablation of Ti targets at air background yields crystalline titania nanostructures. The formation of crystalline titania nanostructures is preceded b thermal mechanism of nucleation and growth. The results point out that laser pulse repetition and dwell time can control the density, size, and pore size of the engineered nanofibrous structure. As the deposition rate of nanostructures is analogous to the ablation rate of the target, higher density of nanofibrous structure is seen at greater laser fluences. The predicted theory can be applied to predict ablation mechanism and nanofiber formation of different materials.

Laser ablation of Si in water and ambient air

2002 ◽  
Author(s):  
Sha Zhu ◽  
Minghui Hong ◽  
M. L. Koh ◽  
Yongfeng Lu
Keyword(s):  
Laser Ablation ◽  
Ambient Air

scholarly journals STEAM LASER CLEANING OF SILICON SURFACES: LASER-INDUCED GAS BUBBLE NUCLEATION AND EFFICIENCY MEASUREMENTS

2002 ◽  
pp. 255-310 ◽  
Author(s):  
P. Leiderer ◽  
M. Mosbacher ◽  
V. Dobler ◽  
A. Schilling ◽  
O. Yavas ◽  
...  
Keyword(s):  
Bubble Nucleation ◽  
Laser Cleaning ◽  
Silicon Surfaces ◽  
Gas Bubble

Morphology, structure and density evolution of carbon nano-structures deposited by N-IR pulsed laser ablation of graphite

2008 ◽  
Vol 17 (7-10) ◽  
pp. 1476-1481 ◽  
Author(s):  
E. Cappelli ◽  
C. Scilletta ◽  
M. Servidori ◽  
V. Valentini ◽  
S. Orlando
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Density Evolution ◽  
Nano Structures

Femtosecond pulse laser ablation of sapphire in ambient air

2004 ◽  
Vol 228 (1-4) ◽  
pp. 221-226 ◽  
Author(s):  
X.C. Wang ◽  
G.C. Lim ◽  
H.Y. Zheng ◽  
F.L. Ng ◽  
W. Liu ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulse Laser ◽  
Femtosecond Pulse ◽  
Pulse Laser Ablation ◽  
Ambient Air ◽  
Femtosecond Pulse Laser
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