scholarly journals 3-D aluminum nanostructure with microhole array synthesized by femtosecond laser radiation for enhanced light extinction

2021 ◽  
Author(s):  
Abdul Salam Mahmood ◽  
Krishnan Venkatakrishnan ◽  
Bo Tan
Keyword(s):  
Femtosecond Laser ◽  
Light Absorption ◽  
Target Surface ◽  
Laser Pulses ◽  
Pulse Frequency ◽  
Femtosecond Laser Pulses ◽  
Light Extinction ◽  
Ambient Conditions ◽  
Aluminum Target ◽  
Microhole Array

This article presents 3-D aluminum micro-nanostructures for enhanced light absorption. Periodic microhole arrays were created by firing a train of femtosecond laser pulses at megahertz pulse frequency onto the surface of an aluminum target at ambient conditions. The laser trains ablated the target surface and created microholes leading to the generation of deposited nanostructures inside and around the microholes. These micro-nanostructures showed enhanced light absorption, which is attributed to surface plasmonics induced by the generation of both nano- and microstructures. These micro-nanostructures may be promising for solar cell applications.

scholarly journals 3-D aluminum nanostructure with microhole array synthesized by femtosecond laser radiation for enhanced light extinction

2021 ◽  
Author(s):  
Abdul Salam Mahmood ◽  
Krishnan Venkatakrishnan ◽  
Bo Tan
Keyword(s):  
Femtosecond Laser ◽  
Light Absorption ◽  
Target Surface ◽  
Laser Pulses ◽  
Pulse Frequency ◽  
Femtosecond Laser Pulses ◽  
Light Extinction ◽  
Ambient Conditions ◽  
Aluminum Target ◽  
Microhole Array

This article presents 3-D aluminum micro-nanostructures for enhanced light absorption. Periodic microhole arrays were created by firing a train of femtosecond laser pulses at megahertz pulse frequency onto the surface of an aluminum target at ambient conditions. The laser trains ablated the target surface and created microholes leading to the generation of deposited nanostructures inside and around the microholes. These micro-nanostructures showed enhanced light absorption, which is attributed to surface plasmonics induced by the generation of both nano- and microstructures. These micro-nanostructures may be promising for solar cell applications.

scholarly journals Synthesis of Nanotips Through Femtosecond Laser Ablation of Glass with Assisted Gas

2021 ◽  
Author(s):  
Nikunj Patel
Keyword(s):  
Femtosecond Laser ◽  
Building Materials ◽  
High Vacuum ◽  
Synthesis Method ◽  
Femtosecond Laser Ablation ◽  
Target Surface ◽  
Laser Pulses ◽  
Single Step ◽  
Femtosecond Laser Irradiation ◽  
Ambient Conditions

Nanotips are the key nanostructures for many applications. Until now, the nanotips of only the crystalline materials have been produced via various deposition methods which require sophisticated equipment, high vacuum, and clean room operations. This thesis proposes a single step, rapid synthesis method using femtosecond laser irradiation at megahertz frequency with background flow of nitrogen gas at ambient conditions. Amorphous nanotips are obtained without the use of catalyst. The nanotips grow from highly energetic plasma generated when target is irradiated with laser pulses. The vapor condensates, nanoparticles and droplets from the plasma get deposited back on to the hot target surface where they experience force imbalance due to which the stems for the nanotips growth are initiated. Once the stems are generated, the continuous deposition of vapor condensates [sic] provides building materials to the stems to complete the growth of nanotips. Further study found that the growth of the nanotips is influenced by laser parameters and gas conditions.

Infrared Light Absorption and Emissivity of Silicon Microstructured by Femtosecond Laser in SF6

2011 ◽  
Vol 287-290 ◽  
pp. 364-368 ◽  
Author(s):  
Yuan Li ◽  
Guo Jin Feng ◽  
Li Zhao
Keyword(s):  
Femtosecond Laser ◽  
Wavelength Range ◽  
Light Absorption ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Infrared Light ◽  
Structure Defects ◽  
Wide Wavelength Range ◽  
Different Temperatures ◽  
Tentative Explanation

The surface microstructured silicon prepared by femtosecond laser pulses irradiation in SF6shows significantly enhanced light absorption over a wide wavelength range. Absorptance of microstructured silicon is measured from 2 to 16μm, and the absorptance can up to 0.8 in the measured wavelength range. The absorptance of microstructured silicon increases as the height of spikes increases. Emissivity of microstructured silicon at different temperatures(100°C-400°C) is measured from 2.5μm to 25μm. Greatly enhanced emissivity compared to that of flat silicon was observed. At a certain temperature, with increasing the height of the spikes, the emissivity increases. For a sample with 13–14μm high spikes, the emissivity at a temperature of 100°C is approximately 0.96. A tentative explanation for the high absorptance of microstructured silicon has been carried out from three aspects: impurity states, structure defects and multiple reflection of light between spikes. The excellent properties of microstructured silicon make it a promising candidate for applications of infrared detectors, silicon solar cells, flat blackbody source and so on.

A fast electron jet along target surface irradiated by femtosecond laser pulses

2006 ◽  
Vol 133 ◽  
pp. 413-416
Author(s):  
Y. T. Li ◽  
X. H. Yuan ◽  
Z. Y. Zheng ◽  
M. H. Xu ◽  
Y. Y. Ma ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fast Electron ◽  
Target Surface ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Structurally colored stainless steel processed by using femtosecond laser pulses

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040016
Author(s):  
Caizhen Yao ◽  
Yuan Li ◽  
Shizhen Xu ◽  
Xinxiang Miao ◽  
Yayun Ye ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Femtosecond Laser ◽  
Periodic Structures ◽  
Normal Incidence ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Control Surface ◽  
Laser Polarization ◽  
Ambient Conditions ◽  
In Situ Preparation

Structurally colored stainless steel (SS) surfaces were produced by using femtosecond laser at normal incidence at ambient conditions. The influence of laser polarization on the surface properties was investigated. The surface morphologies, roughness and color of the laser-treated surface were characterized by using environmental scanning electron microscope (ESEM), roughmeter and atomic force microscope (AFM). Results indicated that the circular polarization leads to more random structures than the horizontally linear polarization. Specimen with the highest surface roughness shows the brightest color. Different colors are cyclically exhibited by changing view angles due to different orders of diffraction. This investigation developed the technique of using femtosecond laser in situ preparation of periodic structures on 304 SS, and indicating that laser polarization is an important parameter to control surface structures to achieve different colors.

Transient light absorption induced in glassby femtosecond laser pulses

2009 ◽  
Vol 39 (10) ◽  
pp. 933-937
Author(s):  
I V Blonskii ◽  
V N Kadan ◽  
O I Shpotyuk ◽  
I A Pavlov ◽  
N N Kryuchkov
Keyword(s):  
Femtosecond Laser ◽  
Light Absorption ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses
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