Pulsed Laser Deposition of Amorphous Diamond-Like Carbon Films with ArF (193 Nm) Excimer Laser PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 30
Book Description
We have deposited hydrogen-free diamond-like amorphous carbon (amorphous diamond) films by ArF (193 nm) pulsed laser ablation of graphite. The deposition process is performed with the laser power density of only 5x10(8) W/cm2 at room temperature without any auxiliary energy source incorporation. The resulting films possess remarkable physical, optical and mechanical properties which are close to those of diamond and distinct from the graphite target used. The films have a mechanical hardness up to 38 GPa, an optical energy band gap of 2.6 eV and excellent thermal stability. Analysis of electron energy loss spectroscopy reveals the domination of diamond-type tetrahedral bonding structure in the films with the Sp3 bond fraction over 95%. Compared to other reported results of pulsed laser deposited diamond-like carbon films, our experimental results confirm that the laser wavelength or photon energy plays a crucial role in controlling the properties of the pulsed laser deposited diamond-like carbon films.
Author: Publisher: ISBN: Category : Languages : en Pages : 30
Book Description
We have deposited hydrogen-free diamond-like amorphous carbon (amorphous diamond) films by ArF (193 nm) pulsed laser ablation of graphite. The deposition process is performed with the laser power density of only 5x10(8) W/cm2 at room temperature without any auxiliary energy source incorporation. The resulting films possess remarkable physical, optical and mechanical properties which are close to those of diamond and distinct from the graphite target used. The films have a mechanical hardness up to 38 GPa, an optical energy band gap of 2.6 eV and excellent thermal stability. Analysis of electron energy loss spectroscopy reveals the domination of diamond-type tetrahedral bonding structure in the films with the Sp3 bond fraction over 95%. Compared to other reported results of pulsed laser deposited diamond-like carbon films, our experimental results confirm that the laser wavelength or photon energy plays a crucial role in controlling the properties of the pulsed laser deposited diamond-like carbon films.
Author: Bernd Schultrich Publisher: Springer ISBN: 3662559277 Category : Technology & Engineering Languages : en Pages : 769
Book Description
This book presents the status quo of the structure, preparation, properties and applications of tetrahedrally bonded amorphous carbon (ta-C) films and compares them with related film systems. Tetrahedrally bonded amorphous carbon films (ta-C) combine some of the outstanding properties of diamond with the versatility of amorphous materials. The book compares experimental results with the predictions of theoretical analyses, condensing them to practicable rules. It is strictly application oriented, emphasizing the exceptional potential of ta-C for tribological coatings of tools and components.
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: Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
Amorphous diamond films have been synthesized by pulsed excimer (ArF) laser ablation of graphite at room temperature. Detailed studies of the energy- dependent complex dielectric function in the energy range up to 40 eV have been carried out by Kramers-Kronig dispersion analysis of transmission electron energy loss spectroscopy and spectroscopic ellipsometry. Distinct from those of graphitic amorphous carbon and diamond-like carbon, the optical constants of amorphous diamond films are closely related to that of crystalline diamond, but with a smooth band structure, a decrease in the magnitude strength, and band shift towards lower energies. The variation of dielectric function from crystalline diamond to amorphous diamond is analogue to those of crystalline and amorphous semiconductors such as Si and Ge. The extracted optical energy band gap reaches 2.6 eV, the highest value among the reported results of amorphous carbon films. The implication of dielectric function to the bond structure analysis of a-D films has also confirmed its diamond character. All of these provide further evidence of the existence of amorphous diamond ... Dielectric function, Amorphous diamond, Laser ablation.
Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
A comparative study of ArF- and KrF-laser generated carbon plasmas has been performed under pulsed laser deposition conditions of amorphous diamond-like carbon (DLC) films. Gated-ICCD species-resolved imaging, luminescence spectroscopy and ion probe diagnostics have revealed distinct differences between the carbon plumes generated by ArF- and KrF-lasers. KrF-laser (6.7 J/cm2) irradiation produces a less energetic carbon plasma containing larger amounts of luminescent C2 compared with ArF-laser ablation at the same energy fluence. Spectroscopic ellipsometry and EELS analysis of the DLC films deposited on Si 100 and NaCl substrates were utilized to characterize the high quality ArF- and KrF-laser deposited films (up to 84% of sp3 bonded carbon for 7 J/cm2-ArF-laser DLC film). The more energetic and highly-atomized ArF-laser carbon plasma appears to be responsible for the better diamond-like properties.
Author: Chunlei Guo Publisher: CRC Press ISBN: 131531083X Category : Technology & Engineering Languages : en Pages : 733
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.
Author: Samuel H. Cohen Publisher: Springer Science & Business Media ISBN: 1475793251 Category : Technology & Engineering Languages : en Pages : 243
Book Description
This book represents the compilation of papers presented at the second Atomic Force Microscopy/Scanning Tunneling Microscopy (AFM/STM) Symposium, held June 7 to 9, 1994, in Natick, Massachusetts, at Natick Research, Development and Engineering Center, now part ofU.S. Army Soldier Systems Command. As with the 1993 symposium, the 1994 symposium provided a forum where scientists with a common interest in AFM, STM, and other probe microscopies could interact with one another, exchange ideas and explore the possibilities for future collaborations and working relationships. In addition to the scheduled talks and poster sessions, there was an equipment exhibit featuring the newest state-of-the-art AFM/STM microscopes, other probe microscopes, imaging hardware and software, as well as the latest microscope-related and sample preparation accessories. These were all very favorably received by the meeting's attendees. Following opening remarks by Natick's Commander, Colonel Morris E. Price, Jr., and the Technical Director, Dr. Robert W. Lewis, the symposium began with the Keynote Address given by Dr. Michael F. Crommie from Boston University. The agenda was divided into four major sessions. The papers (and posters) presented at the symposium represented a broad spectrum of topics in atomic force microscopy, scanning tunneling microscopy, and other probe microscopies.
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Author: Bernd Schultrich
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Author: Robert Eason
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Author: Chunlei Guo
Author: Samuel H. Cohen