scholarly journals Ductile dicing of LiNbO 3 ridge waveguide facets to achieve 0.29 nm surface roughness in single process step

2017 ◽  
Vol 53 (25) ◽  
pp. 1672-1674 ◽  
Author(s):  
L.G. Carpenter ◽  
S.A. Berry ◽  
C.B.E. Gawith
Keyword(s):  
Surface Roughness ◽  
Ridge Waveguide ◽  
Process Step ◽  
Single Process ◽  
Single Process Step

Application of Tem on Sub-Half Micron Semiconductor Devices

1998 ◽  
Vol 523 ◽  
Author(s):  
Hong Zhang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Failure Analysis ◽  
Process Evaluation ◽  
Semiconductor Devices ◽  
Single Source ◽  
Process Step ◽  
Transmission Electron ◽  
Single Process ◽  
Single Process Step

AbstractApplication of transmission electron microscopy on sub-half micron devices has been illustrated in terms of process evaluation and failure analysis. For process evaluation, it is emphasized that a large number of features need to be examined in order to have reliable conclusions about the processes, while for failure analysis, the goal is to pin-point a single process step causing failure or a single source introducing the particle defect.

Morphological evolution of nanometer-sized BaTiO3 particles

1996 ◽  
Vol 54 ◽  
pp. 676-677
Author(s):  
C. M. Chun ◽  
A. Navrotsky ◽  
I. A. Aksay
Keyword(s):  
Heat Treatment ◽  
Colloidal Stability ◽  
Morphological Evolution ◽  
Titanium Isopropoxide ◽  
Precipitate Size ◽  
Hydrothermal Conditions ◽  
Process Step ◽  
Polyhedral Particles ◽  
Single Process ◽  
Single Process Step

Highly pure, stoichiometric, nanometer-sized, and fairly monodispersed anhydrous crystalline BaTiO3 particles are synthesized under hydrothermal conditions in a single process step without further heat treatment by reacting titanium isopropoxide [Ti(OC3H7)4] precursor in aqueous solutions of Ba(OH)2 at 80°C. Traditional considerations of solution hydrolysis, solute condensation, and nucleation only partly explain the generation of the “raspberry-like” BaTiO3 particles composed of 5∼10 nm primary crystalline particles. Consequently, the colloidal interaction of the precipitating particles and, therefore, controlled aggregation of freshly nucleated particles must be taken into account. Our TEM studies show aggregation growth of small subunits to form uniform, rounded polyhedral particles, suggesting colloidal stability may play a key role in controlling precipitate size and shape.In order to investigate the evidence supporting the aggregation growth, Ti(OC3H7)4 precursor (Aldrich) has been added to l.OM Ba(OH)2 solution and hydrothermally reacted at 80°C in polyethylene bottles. Four molecules of water and two hydroxyl ions attach through their oxygen atoms to the titanium of Ti(OC3H7)4 in a nucleophilic process.

Advanced Anodic Bonding Processes For MEMS Applications

2003 ◽  
Vol 782 ◽  
Author(s):  
V. Dragoi ◽  
P. Lindner ◽  
T. Glinsner ◽  
M. Wimplinger ◽  
S. Farrens
Keyword(s):  
Three Dimensional ◽  
Anodic Bonding ◽  
Process Conditions ◽  
Wafer Level ◽  
Process Step ◽  
Packaging Process ◽  
Powerful Technique ◽  
Wafer Level Packaging ◽  
Single Process ◽  
Single Process Step

ABSTRACTAnodic bonding is a powerful technique used in MEMS manufacturing. This process is applied mainly for building three-dimensional structures for microfluidic applications or for wafer level packaging. Process conditions will be evaluated in present paper. An experimental solution for bonding three wafers in one single process step (“triple-stack bonding”) will be introduced.

Investigation of Material Combinations Processed via Two-Component Metal Injection Moulding (2C-MIM)

2012 ◽  
Vol 727-728 ◽  
pp. 248-253 ◽  
Author(s):  
Gabriel Benedet Dutra ◽  
Marco Mulser ◽  
Roger Calixto ◽  
Frank Petzoldt
Keyword(s):  
Optical Microscopy ◽  
Injection Moulding ◽  
Interface Layer ◽  
Chemical Compositions ◽  
Interface Quality ◽  
Process Step ◽  
Metal Injection Moulding ◽  
Two Component ◽  
Single Process ◽  
Single Process Step

Joining materials with different properties into a single component is an attractive solution that allows producing parts with unique properties. In this respect, Two-Component Metal Injection Moulding (2C-MIM) presents numerous advantages, since the moulding and joining stage are performed in a single process step. In this work, the challenges, which occur when different materials are combined, are elucidated. Furthermore, the contact between metals with unequal chemical compositions leads to atomic interdiffusion that forms an interface layer. The interface quality is crucial to the production of intact parts after processing. Different material combinations are co-sintered and the interfaces are characterized by means of optical microscopy and EDX/SEM line scans. Further, thermodynamic and kinetic simulations are used to examine the interdiffusion in detail. The results show promising possibilities to combine different materials and helpful methods to examine the interface.

Thermocapillary Patterning of Nanoscale Polymer Films

2009 ◽  
Vol 1179 ◽  
Author(s):  
Mathias Dietzel ◽  
Sandra M Troian
Keyword(s):  
Surface Tension ◽  
Finite Element ◽  
Room Temperature ◽  
Proximity Effects ◽  
Rapidly Solidify ◽  
Process Step ◽  
Spatial Gradients ◽  
Adjacent Structures ◽  
Single Process ◽  
Single Process Step

AbstractWe investigate a method for non-contact patterning of molten polymer nanofilms based on thermocapillary modulation. Imposed thermal distributions along the surface of the film generate spatial gradients in surface tension. The resulting interfacial stresses are used to shape and mold nanofilms into 3D structures, which rapidly solidify when cooled to room temperature. Finite element simulations of the evolution of molten shapes illustrate how this technique can be used to fabricate features of different heights and separation distances in a single process step. These results provide useful guidelines for controlling proximity effects during evolution of adjacent structures.

scholarly journals Development of Combined Manufacturing Technologies for High-Strength Structural Components

2010 ◽  
Vol 137 ◽  
pp. 219-246 ◽  
Author(s):  
Berend Denkena ◽  
Bernd Breidenstein ◽  
Luis de Leon ◽  
Jan Dege
Keyword(s):  
Material Properties ◽  
High Strength ◽  
Tool Geometry ◽  
Structural Components ◽  
Deep Rolling ◽  
Process Step ◽  
Single Process ◽  
Local Modification ◽  
Manufacturing Technologies ◽  
Finishing Processes

Novel manufacturing technologies for high-strength structural components of aluminium allow a local modification of material properties to respond to operational demands. Machining and finishing processes for changing material properties like deep rolling or rubbing are to be combined to a single process step. The intention is the controlled adjustment of the component’s properties by the modification of its subsurface. For that purpose the essential understanding of the interaction mechanisms of the basic processes turning, deep rolling and rubbing is necessary. Influences of the tool geometry as well as of the process parameters on the material properties are investigated. The results will be extended by parameter studies within numerical simulations. Thereafter, combinations of the basic processes in process sequences are analyzed to their ability to modify the subsurface properties. In consideration of these results, a prototypic combined turn-rolling tool is developed

scholarly journals Study on the Electrorheological Ultra-Precision Polishing Process with an Annular Integrated Electrode

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1235
Author(s):  
Cheng Fan ◽  
Yigang Chen ◽  
Yucheng Xue ◽  
Lei Zhang
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Applied Voltage ◽  
Abrasive Particle ◽  
Polishing Process ◽  
Workpiece Surface ◽  
Orthogonal Experiments ◽  
Single Process ◽  
Ultra Precision ◽  
Polishing Tool

Electrorheological (ER) polishing, as a new ultra-precision super-effect polishing method, provides little damage to the workpiece surface and is suitable for polishing all kinds of small and complex curved surface workpieces. In this paper, an ER polishing tool with an annular integrated electrode is developed. The orthogonal experiments are carried out on the six influencing factors of ER polishing which include the applied voltage, the abrasive particle size, the abrasive concentration, the polishing gap, the polishing time and the tool spindle speed. The influence order of these six factors on the ER polishing is obtained. On this basis, the effect of a single process parameter of ER polishing on surface roughness is studied experimentally.

Influence of surface roughness on the optical mode profile in GaN-based violet ridge waveguide laser diodes

2014 ◽  
Author(s):  
Katarzyna Holc ◽  
Annik Jakob ◽  
Thomas Weig ◽  
Klaus Köhler ◽  
Oliver Ambacher ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Laser Diodes ◽  
Ridge Waveguide ◽  
Waveguide Laser ◽  
Optical Mode ◽  
Ridge Waveguide Laser

Lignocellulosic biorefinery: process integration of hydrolysis and fermentation (SSF process)

Holzforschung ◽  
2011 ◽  
Vol 65 (5) ◽  
Author(s):  
Sebastian Poth ◽  
Magaly Monzon ◽  
Nils Tippkötter ◽  
Roland Ulber
Keyword(s):  
Process Integration ◽  
Beech Wood ◽  
Pachysolen Tannophilus ◽  
Process Step ◽  
Fiber Fraction ◽  
Single Process ◽  
Pre Treatment ◽  
Ssf Process ◽  
Hydrolysis Of ◽  
Simultaneous Saccharification

Abstract The aim of the present work is the process integration and the optimization of the enzymatic hydrolysis of wood and the following fermentation of the products to ethanol. The substrate is a fiber fraction obtained by organosolv pre-treatment of beech wood. For the ethanol production, a co-fermentation by two different yeasts (Saccharomyces cerevisiae and Pachysolen tannophilus) was carried out to convert glucose as well as xylose. Two approaches has been followed: 1. A two step process, in which the hydrolysis of the fiber fraction and the fermentation to product are separated from each other. 2. A process, in which the hydrolysis and the fermentation are carried out in one single process step as simultaneous saccharification and fermentation (SSF). Following the first approach, a yield of about 0.15 g ethanol per gram substrate can be reached. Based on the SSF, one process step can be saved, and additionally, the gained yield can be raised up to 0.3 g ethanol per gram substrate.

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