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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The 1999 Nobel Prize in Chemistry recognized the importance and growing maturity of the femtosecond time-scale in science and engineering. Understanding the interaction between materials and high energy density light to manufacture and process materials has become a key issue in both programmatic and fundamental research at Lawrence Livermore National Laboratory. We have emphasized in this research the aspects related to producing thin films by ablation of material with intense ultra-short laser pulses. Our effort during FY2000 has been focused on building the foundation of this research using high purity graphite as the initial ablation material. We have deposited diamond-like carbon (DLC) in vacuum, measured ablation rates, and characterized the physical and chemical properties of the films. We successfully completed our first objective to compare the microstructure and materials properties of the films deposited using lasers operated in the femtosecond and nanosecond pulse length regime. The mechanical characterization of the deposits showed improved film-substrate adhesion properties that allowed us to build 200-[mu]m thick layers using 150 fs pulses. Films produced with ns-pulses delaminated as soon as the thickness reached only a couple of microns. The stresses in the films were greatly influenced by the fluence and the duration of the laser pulses. The microstructure and surface morphology of the films did not vary significantly with the processing parameters studied (pulse length and fluence). Finally, we demonstrated that it is possible to significantly increase the deposition rate with shorter pulses at a given fluence. In particular, carbon could be deposited at a rate of 25 [mu]m/hour with this technology. Our goal in FY2001 is to study and model the relationship between the ablation plume characteristics (energy, charge, mass, and momentum) and the film growth behavior in order to influence and optimize the deposition process. We also want to determine if the laser parameters influence the stoichiometry of the deposits when compounds or alloys are used as ablation targets. We plan to investigate materials such as TiC, SiC, AlN, and polymers for the study.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The 1999 Nobel Prize in Chemistry recognized the importance and growing maturity of the femtosecond time-scale in science and engineering. Understanding the interaction between materials and high energy density light to manufacture and process materials has become a key issue in both programmatic and fundamental research at Lawrence Livermore National Laboratory. We have emphasized in this research the aspects related to producing thin films by ablation of material with intense ultra-short laser pulses. Our effort during FY2000 has been focused on building the foundation of this research using high purity graphite as the initial ablation material. We have deposited diamond-like carbon (DLC) in vacuum, measured ablation rates, and characterized the physical and chemical properties of the films. We successfully completed our first objective to compare the microstructure and materials properties of the films deposited using lasers operated in the femtosecond and nanosecond pulse length regime. The mechanical characterization of the deposits showed improved film-substrate adhesion properties that allowed us to build 200-[mu]m thick layers using 150 fs pulses. Films produced with ns-pulses delaminated as soon as the thickness reached only a couple of microns. The stresses in the films were greatly influenced by the fluence and the duration of the laser pulses. The microstructure and surface morphology of the films did not vary significantly with the processing parameters studied (pulse length and fluence). Finally, we demonstrated that it is possible to significantly increase the deposition rate with shorter pulses at a given fluence. In particular, carbon could be deposited at a rate of 25 [mu]m/hour with this technology. Our goal in FY2001 is to study and model the relationship between the ablation plume characteristics (energy, charge, mass, and momentum) and the film growth behavior in order to influence and optimize the deposition process. We also want to determine if the laser parameters influence the stoichiometry of the deposits when compounds or alloys are used as ablation targets. We plan to investigate materials such as TiC, SiC, AlN, and polymers for the study.
Author: Robert Eason Publisher: John Wiley & Sons ISBN: 0470052112 Category : Science Languages : en Pages : 754
Book Description
Edited by major contributors to the field, this text summarizes current or newly emerging pulsed laser deposition application areas. It spans the field of optical devices, electronic materials, sensors and actuators, biomaterials, and organic polymers. Every scientist, technologist and development engineer who has a need to grow and pattern, to apply and use thin film materials will regard this book as a must-have resource.
Author: Liviu Duta Publisher: MDPI ISBN: 3036510443 Category : Medical Languages : en Pages : 224
Book Description
Despite its limitation in terms of surface covered area, the PLD technique still gathers interest among researchers by offering endless possibilities for tuning thin film composition and enhancing their properties of interest due to: (i) the easiness of a stoichiometric transfer even for very complex target materials, (ii) high adherence of the deposited structures to the substrate, (iii) controlled degree of phase, crystallinity, and thickness of deposited coatings, (iv) versatility of the experimental set-up which allows for simultaneous ablation of multiple targets resulting in combinatorial maps or consecutive ablation of multiple targets producing multi-layered structures, and (v) adjustment of the number of laser pulses, resulting in either a spread of nanoparticles, islands of materials or a complete covering of a surface. Moreover, a variation of PLD, known as Matrix Assisted Pulsed Laser Evaporation, allows for deposition of organic materials, ranging from polymers to proteins and even living cells, otherwise difficult to transfer unaltered in the form of thin films by other techniques. Furthermore, the use of laser light as transfer agent ensures purity of films and pulse-to-pulse deposition allows for an unprecedented control of film thickness at the nm level. This Special Issue is a collection of state-of-the art research papers and reviews in which the topics of interest are devoted to thin film synthesis by PLD and MAPLE, for numerous research and industry field applications, such as bio-active coatings for medical implants and hard, protective coatings for cutting and drilling tools withstanding high friction and elevated temperatures, sensors, solar cells, lithography, magnetic devices, energy-storage and conversion devices, controlled drug delivery and in situ microstructuring for boosting of surface properties.
Author: Dongfang Yang Publisher: BoD – Books on Demand ISBN: 9535128116 Category : Technology & Engineering Languages : en Pages : 430
Book Description
Laser ablation refers to the phenomenon in which a low wavelength and short pulse (ns-fs) duration of laser beam irradiates the surface of a target to induce instant local vaporization of the target material generating a plasma plume consisting of photons, electrons, ions, atoms, molecules, clusters, and liquid or solid particles. This book covers various aspects of using laser ablation phenomenon for material processing including laser ablation applied for the deposition of thin films, for the synthesis of nanomaterials, and for the chemical compositional analysis and surface modification of materials. Through the 18 chapters written by experts from international scientific community, the reader will have access to the most recent research and development findings on laser ablation through original research studies and literature reviews.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Thin film thermoelectric coolers offer several advantages that include reliability and integration with device processing. Successful thin film thermoelectric cooling requires integration with thin film diamond or aluminum nitride heat spreaders and the device wafers. Numerous deposition techniques have been attempted previously including evaporation, flash evaporation, molecular beam epitaxy, chemical vapor deposition, and sputtering. In the case of thermoelectric thin films, a primary difficulty is maintaining stoichiometry. In the present effort, thin films of p-type Bi[subscript 0.5]Sb[subscript 1.5]Te3, n-type Bi2Te[subscript 2.7]Se[subscript 0.3] and n-type (Bi2]Te3)90(Sb2Te3)5(Sb2Se3)5 (with 0.13 wt.% SbI3) were deposited on mica and aluminum nitride substrates using Nd-YAG pulsed laser deposition. The film quality in terms of composition and crystal perfection was studied as a function of growth temperature. The films were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) for crystalline quality, and by scanning electron microscopy (SEM) for surface morphology. The films showed uniform thickness and high crystalline quality with a preferred (0 0 n) alignment with the substrates. The Seebeck coefficient, electrical resistivity and Hall mobility were measured and compared with the bulk properties. An improvement in the thermoelectric properties by reduction in laser induced particulates has been demonstrated by the use of lower incident laser energy. The thermoelectric characteristics of the films deposited on AlND Si substrates were found to be superior to those deposited on mica substrates. X-ray mapping and energy-dispersive-spectroscopy were performed to determine the composition and homogeneity of the thin films. The results showed that pulsed laser deposition has the ability to produce congruent transfer of the target composition to the thin.
Author: Mihai Stafe Publisher: Springer Science & Business Media ISBN: 3642409784 Category : Science Languages : en Pages : 241
Book Description
The book introduces ‘the state of the art' of pulsed laser ablation and its applications. It is based on recent theoretical and experimental studies. The book reaches from the basics to advanced topics of pulsed laser ablation. Theoretical and experimental fundamental phenomena involved in pulsed laser ablation are discussed with respect to material properties, laser wavelength, fluence and intensity regime of the light absorbed linearly or non-linearly in the target material. The energy absorbed by the electrons leads to atom/molecule excitation, ionization and/or direct chemical bond breaking and is also transferred to the lattice leading to material heating and phase transitions. Experimental non-invasive optical methods for analyzing these phenomena in real time are described. Theoretical models for pulsed laser ablation and phase transitions induced by laser beams and laser-vapour/plasma interaction during the plume expansion above the target are also presented. Calculations of the ablation speed and dimensions of the ablated micro- and nano-structures are performed. The validity and required refinement of different models in different experimental conditions is provided. The pulsed laser deposition process which bases on collecting the ablated particles on a surface is analyzed in terms of efficiency and quality of the deposited films as a function of ambient conditions, target material, laser parameters and substrate characteristics. The interaction between the incident laser and the ablation plasma is analyzed with respect to its influence on the structures of the deposited films and its capacity to generate high harmonics and single attosecond pulses which are highly desirable in pump-probe experiments.
Author: Dušan Kopecký Publisher: ISBN: 9781612096230 Category : Conducting polymers Languages : en Pages : 0
Book Description
The development of new types of electronic devices based on conductive polymers requires precise and controlled deposition of these materials in thin layers. This book examines the latest results in research of deposition of polypyrrole (PPY) thin films by advanced method - Matrix Assisted Pulsed Laser Evaporation (MAPLE). It also provides a brief survey of the laser deposition of conductive polymers, theoretical analysis of the mechanisms of deposition by MAPLE method, definition of both source-PPY properties and deposition conditions necessary for successful thin layer fabrication.
Author: Hiroaki Misawa Publisher: John Wiley & Sons ISBN: 3527608400 Category : Technology & Engineering Languages : en Pages : 403
Book Description
A thorough introduction to 3D laser microfabrication technology, leading readers from the fundamentals and theory to its various potent applications, such as the generation of tiny objects or three-dimensional structures within the bulk of transparent materials. The book also presents new theoretical material on dielectric breakdown, allowing a better understanding of the differences between optical damage on surfaces and inside the bulk, as well as a look into the future. Chemists, physicists, materials scientists and engineers will find this a valuable source of interdisciplinary knowledge in the field of laser optics and nanotechnology.
Author: Chunlei Guo Publisher: CRC Press ISBN: 1315310848 Category : Technology & Engineering Languages : en Pages : 359
Book Description
This comprehensive handbook gives a fully updated guide to lasers and laser technologies, including the complete range of their technical applications. This third volume covers modern applications in engineering and technology, including all new and updated case studies spanning telecommunications and data storage to medicine, optical measurement, defense and security, nanomaterials processing and characterization. Key Features: • Offers a complete update of the original, bestselling work, including many brand-new chapters. • Deepens the introduction to fundamentals, from laser design and fabrication to host matrices for solid-state lasers, energy level diagrams, hosting materials, dopant energy levels, and lasers based on nonlinear effects. • Covers new laser types, including quantum cascade lasers, silicon-based lasers, titanium sapphire lasers, terahertz lasers, bismuth-doped fiber lasers, and diode-pumped alkali lasers. • Discusses the latest applications, e.g., lasers in microscopy, high-speed imaging, attosecond metrology, 3D printing, optical atomic clocks, time-resolved spectroscopy, polarization and profile measurements, pulse measurements, and laser-induced fluorescence detection. • Adds new sections on laser materials processing, laser spectroscopy, lasers in imaging, lasers in environmental sciences, and lasers in communications. This handbook is the ideal companion for scientists, engineers, and students working with lasers, including those in optics, electrical engineering, physics, chemistry, biomedicine, and other relevant areas.
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Author: 
Author: Robert Eason
Author: Liviu Duta
Author: Dongfang Yang
Author: Xiao Shizhou![Pulsed Laser Deposition of Bi[sub]2[/sub]Te[sub]3[/sub] Based Thermoelectric Thin Films PDF](https://books.google.com/books/content/images/frontcover/fmiWAQAACAAJ?fife=w80-h100)
Author: 
Author: Mihai Stafe
Author: Dušan Kopecký
Author: Hiroaki Misawa
Author: Chunlei Guo