fabrication of optics by diamond turning

... 2.3 Diamond Machining of Mold 27 2.3.1 Exploration of Diamond Turning on Electroless Nickel 27 2.3.2 Exploration of Diamond Turning on SU8 .32 2.3.3 Exploration of Diamond Turning ... Alternatives to Diamond Turning 15 1.4 Soft Lithography 17 Chapter Fabrication Methods 22 2.1 Motivation Behind Using Diamond Turning and Soft Lithography 22 2.2 Overview of Fabrication ... have been successfully fabricated with diamond turning [21] Another example of the applications of diamond turning is the fabrication of a special type of aspherical mirror known as Wolter type...

Ngày tải lên: 26/09/2015, 10:43

... http://www.nanoscalereslett.com/content/6/1/400 Page of Figure AFM images of the HfO2 nanopattern (a) Three-dimensional view of the nanostructured HfO2/GaAs surface morphology (b) Crosssection scan profile of an etched trench ... profile with a 70° inclination angle is achieved by the formation of a sidewall passivation layer comprised of non-volatile reaction by- products of the CF4 etching process It should be noted here ... Figure illustrates the HfO2 nanofabrication process flow The structure of the nanopatterned HfO2/GaAs samples was investigated by HR-TEM Figure 5a, b, c depicts a series of cross-section HR-TEM images...

Ngày tải lên: 21/06/2014, 03:20

... partially covered by polycrystalline chips of Si and Ge, and a second target of pure SiO2 The surface ratio of the Si and Ge pieces in the SiO2 target was 2:1 Before sputtering, a pressure of at least ... temperature Page of using the 488 nm line of an argon ion laser The laser beam was focused on the sample surface with a beam spot size of μm and a power of 0.2 mW to avoid the heating of the sample ... at./cm2) Figure Depth profiles of different elements (Si, O, and Ge) obtained from fits of measured RBS, for the as-grown and annealed films appear because of the existence of a 3D correlation in...

Ngày tải lên: 21/06/2014, 04:20

... mediated by a PDMS template By means of using the diluted (2%) mixed acid solution as a chemical etchant, the wet soft stamp can indent nanoscale shallow concaves on aluminum without the need of excessive ... structuring hard materials by chemical etching reaction Regardless of the substrate type, the mechanism of localized microetching relied on the diffusive transport of chemicals within a stamp ... cm2) A detailed investigation of the film topography was performed by AFM as Figure 2b,c shows The pitches of grating patterns are 555 and 277 nm with pattern heights of 40 and 25 nm, respectively...

Ngày tải lên: 21/06/2014, 05:20

... formation of 10 ML of GaAs in the presence of As was supplied to the substrate surface, for the droplets formation After that, the substrate temperature was decreased to 250°C and an As BEP of 10-7 ... complete reaction of metallic Ga with As It is worth mentioning that a growth interruption time of around h was used to reach the thermal stability of the sample after each change of the substrate ... growth, the samples were taken out of the chamber for the morphological analysis by AFM and optical investigation by PL Three samples were prepared: Sample A by stopping the growth just after...

Ngày tải lên: 21/06/2014, 08:20

... diffraction peaks of Au in the XRD pattern of Au/ C–AAO are identical to those of Au–AAO [15] This indicates that the crystal structure of the Au nanoparticles Fig XRD patterns of (a) carbonized ... region of the channel At the same time, due to the strong adhesion between the aluminol groups of AAO and the hydroxyl groups of sucrose, [21] a thin layer of sucrose might remain on the wall of ... diameter of the Au nanoparticles and the distance of the bridge in the crosslinked CNFs is the same as the diameter of AAO channel suggests that the fibers are the splits of the tubular shape of carbon...

Ngày tải lên: 21/06/2014, 20:20

... like to thank Prof S S Fan, Prof Y D Li, Prof L J Bie, and Mr Y C Sun for their help and valuable discussions This work was supported by the National Natural Science Foundation of China under ... that most of the alumina nanowires have been converted into the AlN nanowires during heat treatment Fig FE-SEM images of densely packed alumina nanowires produced by chemical etching of the porous ... the supplement of the additional evaporated aluminum, and thus gives a larger diameter of the AlN nanowires than that of the Al2O3 ones Summary and Conclusions Fig FE-SEM image of close-packed...

Ngày tải lên: 21/06/2014, 20:20

... 1960 by Egerton and Dillon [1] It also has a high curie temperature of 420°C, piezoelectric constant (d33) of 80 pC/N, and coupling factor coefficient (kp) of 0.35 The crystal structure of KNN ... Pengpat*1,2 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand Materials Science Research Center, Faculty of Science, Chiang Mai ... 1 Fabrication of transparent lead-free KNN glass ceramics by incorporation method Ploypailin Yongsiri1, Sukum Eitssayeam1,2, Gobwut...

Ngày tải lên: 22/06/2014, 00:20

... Discussion Plasma Treatment of SWCNT and Fabrication of SWCNT@SiO2 Therby The side walls of SWCNTs can be modified with hydroxyl groups by means of plasma treatment The presence of hydroxyl groups bearing ... diameter of ca nm) The further evidence of the existence of Ag nanoparticles is provided by EDS (Fig 3e), which reveals the presence of S and Ag on the surface of SWCNT@SiO2/Ag Similarly, by using ... introduce hydroxyl groups homogeneously on the side walls of SWCNTs Preparation of SWCNT@SiO2 Composite Scheme Schematic illustration of fabrication of SiO2-coated single wall carbon nanotubes (SWCNT@SiO2)...

Ngày tải lên: 22/06/2014, 00:20

... micrographs of annealed samples S3 and S4 The inset is the image of the product with high magnification image b, d The corresponding size distribution histograms of S3 and S4 e The magnification image of ... Doctoral Program of Higher Education (No 20070486069) and the Young Chenguang Project of Wuhan City (No 2008507 31371) for financial support The author also thanks Associate Prof H -Y Zhang of Tsinghua ... 1) We analyse the different aspects of our synthetic approach and discuss the morphology, structure and magnetic properties of these NPs These systems may be of particular interests for fabricating...

Ngày tải lên: 22/06/2014, 00:20

... In order to compare the intensity of the luminescence of all the samples as accurately as possible, the position and power of the pumping beam and the width of the slit to collect the luminescence ... ionic radius of 0.129 nm are partially substituted by Cd2? ions whose ionic radius is 0.097 nm and RE-ion with ionic radius about 0.100 nm [15] This result is further supported by TEM of our glass-ceramics ... dispersion of surface active agent Figure shows the XRD spectrum and TEM image of nano-particles after corrosion treatment process Phase identification of the nano-particles has been studied by using...

Ngày tải lên: 22/06/2014, 01:20

... 461 Fig Scheme of the fabrication of highly ordered polymeric nanodot and nanowire arrays templated by nanoporous thin films Characterization of the Ordered Thin Films The thickness of the polymer ... the samples were treated in vapors of chloroform to arrange parallel alignment of the nanodomains Nanoporous thin film was fabricated by selective extraction of HABA with methanol The nanoporous ... chloroform, methanol, and dichloromethanes were purchased from Acros Organics and used as supplied Fabrication of Ordered Nanodots and Nanowire Arrays PS-PVP and HABA (1 mol of HABA and mol of...

Ngày tải lên: 22/06/2014, 01:20

... 2:107–111 Experimental Fabrication of CuO nanoparticle interlinked microsphere cages can be very simple by conversion of conventional CuO in solution and similar to that of converting conventional ... floated on the surface of the solutions but not precipitated down to the bottom of beakers, we can imagine that the precipitations were taken onto the surface of the solutions by ammonia gas Figure ... spectra of (" 111) and (111) plane to estimate their crystallite size and then average them in order to decrease the error of the system The XRD peaks of monoclinic tenorite CuO (" 111) and (111) of...

Ngày tải lên: 22/06/2014, 22:20

... using diamond turning Hence, a hybrid fast tool/slow slide servo (FTS/SSS) diamond turning was developed by incorporating both FTS and SSS techniques to optimize the fabrication process of hybrid ... manufactured by multiple-axis diamond machining techniques Basically, an increasing complexity is often associated with a loss of symmetry of the surface With an increase in the number of degrees of freedom ... ultraprecision turning machine [9] Unlike FTS method, SSS diamond turning uses the existing Z-axis to oscillate the tool Some of the freeform optical surfaces manufactured by FTS and SSS diamond turning...

Ngày tải lên: 09/09/2015, 08:18

... effect” by Prof W Barthlott, a botanist of the University of Bonn [1] By mimicking lotus leaves, numerous artificial super-hydrophobic surfaces were fabricated by various methods for a wide range of ... subtle yet encouraging ways i Table of contents TABLE OF CONTENTS ACKNOWLEDGEMENTS i TABLE OF CONTENTS ii SUMMARY vi LIST OF FIGURES ix LIST OF TABLES viii LIST of PUBLICATIONS xiv CHAPTER INTRODUCTION ... List of figures LIST OF FIGURES Figure 1: Figure 2: The derivation of Young’s equation from thermodynamics for solid-liquid-vapor systems the theory of 20 Schematic images of the wetting of a...

Ngày tải lên: 09/09/2015, 10:02

... determined by the proton beam energy The end of range of protons and the profile of the penetration path in different materials can be simulated by Monte Carlo calculations using software such ... silicon are rough because of the porosity of porous silicon 10 2.2.1 Fabrication procedures PSi is fabricated by electrochemical anodization of bulk silicon wafers in hydrofluoric acid (HF) The ... bending waveguides and the method of optical characterization Chapter focuses on the procedure of fabrication of silicon-on-oxidized porous silicon waveguides Fabrication of silicon-on-oxidized porous...

Ngày tải lên: 09/09/2015, 11:21

... error map of a lens on workpiece IV 112 Figure 6.1 Working principle for FTS diamond turning of MLA 116 Figure 6.2 Visualization for the surface formation of FTS diamond turning of MLA: ... Machining mechanism of the FTS diamond turning In addition to the performance of the FTS diamond turning machine, e.g the accuracy of the generated tool path and the tracking performance of the FTS, ... making of molds for their production These processes include diamond turning, milling, grinding, and micro-engraving Among them, diamond turning is the focus of this study National University of...

Ngày tải lên: 10/09/2015, 15:52

... and locations of the nanostructures As most of the fabrication processes make use of metal-catalyzed Vapor-Liquid-Solid (VLS) growth of silicon, the basic concepts of agglomeration of a thin metal ... Plot of total dose distribution as a result of the superposition of two perpendicular exposures of equal amplitude (d) A three dimensional view of plot c, showing the peak, saddle, and minimum of ... result of the superposition of the two exposures of equal amplitude (d) A three dimensional view of plot c, showing the peak, saddle, and minimum of the dose distribution 103 xii List of...

Ngày tải lên: 12/09/2015, 11:29

... 42 2.5.3 Fabrication of AAO fabrication from Al foil 43 2.5.4 Fabrication of AAO fabrication from Al thin film 44 2.5.5 Comparison of two AAO fabrication methods 45 ... showing SEM image of SiO2 template 88 5.7 SEM image of GaAs QRs grown by DE 90 xiii 5.8 SEM image of InGaAs QRs grown by DE 91 5.9 SEM image of GaAs QRs grown by DE on SiO2 template ... an array of nanoholes is desired as the final positive mask, a negative mask of an array of rods would first be created This is followed by deposition of a desired material and lift-off of the...

Ngày tải lên: 30/09/2015, 06:04

... especially grateful to Prof William B Krantz Isac mayor professor in Dept of Chemical & Biomolecular Engineering of NUS for his wise guidance regarding my first paper in the journal of membrane science ... experiments…………………………………………………………………… 35 Chapter Fabrication of Dual Layer Hydrophilic-Hydrophobic Hollow Fibers 5.1 Effect of coagulant on the surface morphology of PVDF membranes………………… 37 5.2 First batch of fiber spinning…………………………………………………………… ... Spinning conditions of hollow fiber membrane fabrication viii List of Figures Fig.1.1 Distribution of Earth’s water Fig.1.2 Fresh water resources Fig.1.3 Schematic presentation of a Multi-Stage...

Ngày tải lên: 04/10/2015, 10:24