Design and fabrication of lenses on the top of an optical fiber for efficient fiber-to-waveguide coupling by means of Focus Ion Beam (FIB) lithography

2004 ◽  
Author(s):  
F. Schiappelli ◽  
M. Prasciolu ◽  
D. Cojoc ◽  
S. Cabrini ◽  
E. Di Fabrizio
Keyword(s):  
Optical Fiber ◽  
Ion Beam ◽  
Waveguide Coupling ◽  
Focus Ion Beam

Focused Ion Beam (FIB) Method for Reconditioning Worn Tungsten Atomic Force Probe (AFP) Tips

2005 ◽  
Author(s):  
Randal E. Mulder ◽  
Sam Subramanian ◽  
Tony Chrastecky
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Minimal Amount ◽  
Atomic Force ◽  
Focus Ion Beam

Abstract Atomic force probing (AFP) uses very sharp tungsten tips (100nm in radius) which wear out rather quickly, even with the greater durability of tungsten as compared to silicon. This paper demonstrates how worn tips that no longer image and probe properly can be reconditioned using the focus ion beam (FIB) tool. The method works best for tips that are under approx. 750nm in diameter and are not bent. It works well for freshly manufactured tips that do not work properly due to mishandling or improper storage which allowed particulates/oxide to build up on the tip. The method also works well for fresh tips that have been worn down (or slightly bent) after several hours of scanning and probing. This method is straightforward and requires a minimal amount of time. Typically, four probe tips can be reconditioned in about 30 minutes on the FIB.

scholarly journals Mitigating the Agglomeration of Nanofiller in a Mixed Matrix Membrane by Incorporating an Interface Agent

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 328
Author(s):  
Manh-Tuan Vu ◽  
Gloria M. Monsalve-Bravo ◽  
Rijia Lin ◽  
Mengran Li ◽  
Suresh K. Bhatia ◽  
...  
Keyword(s):  
Gas Separation ◽  
Polymer Matrix ◽  
Ion Beam ◽  
High Surface ◽  
Mixed Matrix Membrane ◽  
Mechanical And Thermal Properties ◽  
Separation Membranes ◽  
Surface Areas ◽  
Separation Membrane ◽  
Focus Ion Beam

Nanodiamonds (ND) have recently emerged as excellent candidates for various applications including membrane technology due to their nanoscale size, non-toxic nature, excellent mechanical and thermal properties, high surface areas and tuneable surface structures with functional groups. However, their non-porous structure and strong tendency to aggregate are hindering their potential in gas separation membrane applications. To overcome those issues, this study proposes an efficient approach by decorating the ND surface with polyethyleneimine (PEI) before embedding it into the polymer matrix to fabricate MMMs for CO2/N2 separation. Acting as both interfacial binder and gas carrier agent, the PEI layer enhances the polymer/filler interfacial interaction, minimising the agglomeration of ND in the polymer matrix, which is evidenced by the focus ion beam scanning electron microscopy (FIB-SEM). The incorporation of PEI into the membrane matrix effectively improves the CO2/N2 selectivity compared to the pristine polymer membranes. The improvement in CO2/N2 selectivity is also modelled by calculating the interfacial permeabilities with the Felske model using the gas permeabilities in the MMM. This study proposes a simple and effective modification method to address both the interface and gas selectivity in the application of nanoscale and non-porous fillers in gas separation membranes.

Advance in the Fabrication of Ordered Ge/Si Nanostructure Array on Si Patterned Substrate by Nanosphere Lithography

2016 ◽  
Vol 852 ◽  
pp. 283-292
Author(s):  
Zheng Hang Xin ◽  
Chong Wang ◽  
Feng Qiu ◽  
Rong Fei Wang ◽  
Chen Li ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Ion Beam ◽  
Nanosphere Lithography ◽  
Extreme Ultraviolet Lithography ◽  
Ultraviolet Lithography ◽  
Patterned Substrate ◽  
Hexagonal Close Packed ◽  
Potential Applications ◽  
Focus Ion Beam ◽  
Si Quantum Dots

The recent process in the fabrication of the ordered Ge/Si quantum dots (QDs) is reviewed. The fabrication step generally started on the preparation of patterned substrate prepared in advance by using several interesting methods, such as photo lithography, focus ion beam (FIB), reactive ion etching (RIE), and extreme ultraviolet lithography (EUV-IL) et al, which are introduced briefly in this article. Here, we’d like to focus on the detailed process of nanosphere lithography (NSL) which has the advantages of less cost and higher product compared with the referred methods. The ordered Ge nanostructures always show as Hexagonal close-packed array on the patterned Si substrate and have the advantages of potential applications in electronic and optoelectronic devices.

scholarly journals Experimental Investigation of the Mechanical and Surface Properties of Sub-Micron Carbon Spheres

Lubricants ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 77
Author(s):  
Abdullah A. Alazemi ◽  
Arthur D. Dysart ◽  
Vilas G. Pol
Keyword(s):  
Elastic Modulus ◽  
Internal Structure ◽  
Surface Properties ◽  
Ion Beam ◽  
Lithium Ion ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Carbon Particles ◽  
Oil Additives ◽  
Focus Ion Beam

This study investigates the mechanical and surface properties of spherical carbon particles. Sub-micrometer carbon spheres were previously used as oil additives to improve the tribological performance of oils, and as anode material to enhance the storage of rechargeable lithium-ion batteries. In the current work, internal structure and chemical analysis of these carbon sphere particles was conducted via focus ion beam scanning electron microscopy, and the results revealed that the carbon sphere particles are pure carbon particles with a solid internal structure. Atomic force microscopy (AFM) and nano-indenter were utilized to explore the mechanical properties (hardness and elastic modulus) of carbon sphere particles. The obtained results showed that the carbon spheres have an elastic modulus in the range of 10 to 42 GPa, while their hardness is in the range of 0.5 to 2.6 GPa. Besides, the AFM scans confirmed that the carbon particles are entirely separated and devoid of agglomeration. These results support the viable use of carbon sphere particles in various engineering applications.

scholarly journals Characterization of Intergranular Corrosion Defects in a 2024 T351 Aluminium Alloy

2016 ◽  
Vol 877 ◽  
pp. 444-449 ◽  
Author(s):  
M.L. de Bonfils-Lahovary ◽  
L. Laffont ◽  
Christine Blanc
Keyword(s):  
Oxide Film ◽  
Intergranular Corrosion ◽  
Ion Beam ◽  
Metallic Copper ◽  
Analytical Techniques ◽  
Propagation Rate ◽  
Structural Defects ◽  
Alumina Oxide ◽  
Corrosion Defects ◽  
Focus Ion Beam

In the 2xxx series alloys, intergranular corrosion is generally related to the strong reactivity of copper-rich intergranular precipitates leading to a copper enrichment of these particles. While the nature of the oxides formed inside the intergranular corrosion defects was assumed to strongly influence the intergranular corrosion propagation rate, it was not clearly identified due to the thickness of the oxide layer formed which required to use high resolution analytical techniques. The present work aims to characterize the intergranular corrosion defects formed for a 2024-T351 aluminum alloy after a 24 hours continuous immersion in a 1 M NaCl solution and compares the results to literature data concerning the oxide layers formed on copper-rich model alloys. A combination of focus ion beam (FIB) technique, transmission electron microscopy (TEM) observations and energy dispersive X-Ray spectroscopy (EDX) analyses was used to accurately characterize both the morphology and chemical composition of the intergranular corrosion defects. Results evidenced the dissolution of intergranular copper-rich particles, the formation of a 10-200 nm-thin metallic copper-rich layer at the oxide/metal interface and the incorporation of copper inside the amorphous alumina oxide film leading to the formation of structural defects of the oxide film.

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