High density semiconductor nanodots by direct laser fabrication

2016 ◽  
Author(s):  
Anahita Haghizadeh ◽  
Haeyeon Yang
Keyword(s):  
High Density ◽  
Laser Fabrication ◽  
Direct Laser ◽  
Direct Laser Fabrication

High density quantum dots by direct laser fabrication

MRS Advances ◽  
2016 ◽  
Vol 1 (28) ◽  
pp. 2025-2030 ◽  
Author(s):  
Anahita Haghizadeh ◽  
Haeyeon Yang
Keyword(s):  
Quantum Dots ◽  
Critical Density ◽  
Laser Pulses ◽  
High Density ◽  
Power Laser ◽  
Laser Fabrication ◽  
Force Microscopy ◽  
Atomic Force ◽  
Direct Laser ◽  
Direct Laser Fabrication

ABSTRACTWe report a study of direct laser fabrication that produces quantum dots with their density higher than the critical density without appearance of large clumps. Atomic force microscopy is used to image GaAs(001) surfaces that are irradiated by high power laser pulses interferentially. The analysis suggests that high density quantum dots be fabricated directly on semiconductor surfaces during epitaxial growth processes.

Direct Laser Fabrication of Compositionally Complex Materials

2020 ◽  
pp. 147-163
Author(s):  
Jithin Joseph
Keyword(s):  
Additive Manufacturing ◽  
Great Promise ◽  
Filler Materials ◽  
Chemical Homogeneity ◽  
Laser Fabrication ◽  
Direct Laser ◽  
Direct Laser Fabrication ◽  
Aerospace Medical ◽  
Complex Engineering ◽  
Cost Efficient

Additive manufacturing (AM) opens up the possibility of a direct build-up of components with sophisticated internal features or overhangs that are difficult to manufacture by a single conventional method. As a cost-efficient, tool-free, and digital approach to manufacturing components with complex geometries, AM of metals offers many critical benefits to various sectors such as aerospace, medical, automotive, and energy compared to conventional manufacturing processes. Direct laser fabrication (DLF) uses pre-alloyed powder mix or in-situ alloying of the elemental powders for metal additive manufacturing with excellent chemical homogeneity. It, therefore, shows great promise to enable the production of complex engineering components. This technique allows the highest build rates of the AM techniques with no restrictions on deposit size/shape and the fabrication of graded and hybrid materials by simultaneously feeding different filler materials. The advantages and disadvantages of DLF on the fabrication of compositionally complex metallic alloys are discussed in the chapter.

Direct Laser Fabrication of Defect Layers in Three-DimensionalChalcogenide Chiral Composites

2013 ◽  
Author(s):  
Benjamin P. Cumming ◽  
Mark. D. Turner ◽  
Sukanta Debbarma ◽  
Barry Luther-Davis ◽  
Gerd E. Schröder-Turk ◽  
...  
Keyword(s):  
Laser Fabrication ◽  
Direct Laser ◽  
Direct Laser Fabrication

Direct laser fabrication and microstructure of a burn-resistant Ti alloy

2002 ◽  
Vol 23 (3) ◽  
pp. 239-247 ◽  
Author(s):  
X. Wu ◽  
R. Sharman ◽  
J. Mei ◽  
W. Voice
Keyword(s):  
Ti Alloy ◽  
Laser Fabrication ◽  
Direct Laser ◽  
Direct Laser Fabrication

Investigation on Inconel 625 Alloy Thin-Walled Parts by Direct Laser Fabrication

2011 ◽  
Vol 189-193 ◽  
pp. 3687-3691 ◽  
Author(s):  
Shi You Gao ◽  
Ye Fei Zhou ◽  
Ming Zhe Xi
Keyword(s):  
Process Parameters ◽  
Inconel 625 ◽  
Influence Of Process Parameters ◽  
Scanning Velocity ◽  
Laser Fabrication ◽  
Direct Laser ◽  
Inconel 625 Alloy ◽  
Direct Laser Fabrication ◽  
Thin Walled

In this paper, the process of direct laser fabricating (DLF) thin-walled parts with Inconel 625 alloy was studied. The interrelationship between deposition quality and process parameters has been analyzed in the aspects of laser power. Scanning velocity, powder feed velocity, z-increment. The further investigations of study lie on the influence of process parameters on geometrical characterization of single cladding layer, the Axis-Z increments on height of thin-walled part, as well as the microstructure of fabricated sample of Inconel 625. The results based on above experiments show that the Inconel 625 alloy parts can be fabricated by direct laser fabrication method and the samples were fully dense, homogenous and free of defects with the parameters under a certain range.

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