One-step facile fabrication of controllable microcone and micromolar silicon arrays with tunable wettability by liquid-assisted femtosecond laser irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 37463-37471 ◽  
Author(s):  
Guoqiang Li ◽  
Zhen Zhang ◽  
Peichao Wu ◽  
Sizhu Wu ◽  
Yanlei Hu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Optoelectronic Devices ◽  
Silicon Surfaces ◽  
Femtosecond Laser Irradiation ◽  
Research Attention ◽  
Nanostructured Silicon ◽  
Wide Range ◽  
One Step ◽  
Facile Fabrication ◽  
Silicon Arrays

Micro/nanostructured silicon surfaces are attracting more and more research attention because of the wide range of applications in optoelectronic devices, microelectronics, microfluidics, and biomedical devices.

scholarly journals Laser-assisted fabrication of gold nanoparticle-composed structures embedded in borosilicate glass

2017 ◽  
Vol 8 ◽  
pp. 2454-2463 ◽  
Author(s):  
Nikolay Nedyalkov ◽  
Mihaela Koleva ◽  
Nadya Stankova ◽  
Rosen Nikov ◽  
Mitsuhiro Terakawa ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Femtosecond Laser ◽  
Borosilicate Glass ◽  
Glass Sample ◽  
Defect Formation ◽  
Laser Pulses ◽  
Femtosecond Laser Irradiation ◽  
Nanosecond Pulses ◽  
Wide Range

We present results on laser-assisted formation of two- and three-dimensional structures comprised of gold nanoparticles in glass. The sample material was gold-ion-doped borosilicate glass prepared by conventional melt quenching. The nanoparticle growth technique consisted of two steps – laser-induced defect formation and annealing. The first step was realized by irradiating the glass by nanosecond and femtosecond laser pulses over a wide range of fluences and number of applied pulses. The irradiation by nanosecond laser pulses (emitted by a Nd:YAG laser system) induced defect formation, expressed by brown coloration of the glass sample, only at a wavelength of 266 nm. At 355, 532 and 1064 nm, no coloration of the sample was observed. The femtosecond laser irradiation at 800 nm also induced defects, again observed as brown coloration. The absorbance spectra indicated that this coloration was related to the formation of oxygen deficiency defects. After annealing, the color of the irradiated areas changed to pink, with a corresponding well-defined peak in the absorbance spectrum. We relate this effect to the formation of gold nanoparticles with optical properties defined by plasmon excitation. Their presence was confirmed by high-resolution TEM analysis. No nanoparticle formation was observed in the samples irradiated by nanosecond pulses at 355, 532 and 1064 nm. The optical properties of the irradiated areas were found to depend on the laser processing parameters; these properties were studied based on Mie theory, which was also used to correlate the experimental optical spectra and the characteristics of the nanoparticles formed. We also discuss the influence of the processing conditions on the characteristics of the particles formed and the mechanism of their formation and demonstrate the fabrication of structures composed of nanoparticles inside the glass sample. This technique can be used for the preparation of 3D nanoparticle systems embedded in transparent materials with potential applications in the design of new optical components, such as metamaterials and in plasmonics.

High-Density Regular Arrays of Nanometer-Scale Rods Formed on Silicon Surfaces via Femtosecond Laser Irradiation in Water

Nano Letters ◽  
2008 ◽  
Vol 8 (7) ◽  
pp. 2087-2091 ◽  
Author(s):  
Mengyan Shen ◽  
James E. Carey ◽  
Catherine H. Crouch ◽  
Maria Kandyla ◽  
Howard A. Stone ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
High Density ◽  
Silicon Surfaces ◽  
Femtosecond Laser Irradiation ◽  
Nanometer Scale ◽  
Regular Arrays

Insights into the surface responses of graphene oxide irradiated by an infrared femtosecond laser

2021 ◽  
Author(s):  
Ye Ding ◽  
Qiang Li ◽  
Jingyi Li ◽  
Lianfu Wang ◽  
Lijun Yang
Keyword(s):  
Graphene Oxide ◽  
Femtosecond Laser ◽  
Electron Density ◽  
Free Electron ◽  
Electrical Response ◽  
Temporal Distribution ◽  
Femtosecond Laser Irradiation ◽  
Time Step ◽  
Free Electron Density ◽  
Wide Range

Abstract Graphene oxide (GO) has emerged as unique and multifaceted novel material with a wide range of applications in electrochemistry and optoelectronic engineering. In these applications, GO surface is characterized with different functional structures in the micro-nano scale, while the femtosecond laser is a promising and versatile tool for manufacturing these structures comparing with conventional approaches. However, the comprehensive surface responses and corresponding regimes of GO surface under femtosecond laser irradiation are not yet identified, which creates obstacles to the further application of femtosecond laser in programming GO surface with specific nanopatterns. Herein, theoretical models characterizing the electrical response, i.e., the transient spatial and temporal distribution of infrared femtosecond laser-excited free electron density at the GO surface layers are established. The numerical simulations are carried out using the discontinuous Galerkin finite element algorithm with a 5 fs time step. The relationship between the laser polarized electric field and free electron density is revealed. On this basis, the surface plasma distribution is characterized, the accuracy of which is verified through the comparison of experimental ablation morphology. Thermal, morphological and chemical responses of the GO surface using different parameters are analyzed correspondingly, from which the formation and evolution mechanisms of surface nanopatterns with different features are explained. This work offers a new insight into the fundamental regimes and feasibility of ultrafast patterning of GO for the application of multifunctional device engineering.

Generation of nano-bumps on transparent quartz glass surface under femtosecond laser irradiation

2008 ◽  
Author(s):  
Wei Guo ◽  
Zeng Bo Wang ◽  
Lin Li ◽  
Zhu Liu ◽  
Boris Luk’yanchuk ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Quartz Glass ◽  
Glass Surface ◽  
Femtosecond Laser Irradiation
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