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  • 1
    Electronic Resource
    Electronic Resource
    Modeling of pyrolytic laser direct writing: Noncoherent structures and instabilities (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 1018-1025 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Three-dimensional simulations of pyrolytic laser direct writing from gas-phase precursors are presented. They are based on a fast method for the calculation of temperature distributions induced by an energy beam in deposits of arbitrary shape. Analytical approximations, fast Fourier transform, and the multigrid technique are combined in the algorithm. Temperature dependences of the absorptivities and heat conductivities of the deposit and the substrate have been taken into account. Self-consistent modeling of the growth process allows one to explain oscillations in the height and width of lines caused by the feedback between the shape of the deposit, the temperature distribution, and the growth rate. For the deposition of W from an admixture of WCl6+H2 and a-SiO2 substrates, the oscillations originate from a sharp increase in the absorptivity of the deposit with temperature. With the deposition of Si from SiH4, or C from CH4, C2H2, and C2H4, onto a-SiO2, the oscillations are related to the large ratio of height/width of the deposit and the increase in temperature on its upper surface. This increase also explains the transition from line-type to fiber-type growth. The hysteresis of this transition with respect to laser power and scanning velocity is explained as well. The same algorithm can be used in the modeling of pyrolytic etching and e-beam microprocessing when the feedback between the temperature distributions and changes in the processing geometry is important. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365865
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  • 2
    Electronic Resource
    Electronic Resource
    Single-pulse ultraviolet laser-induced surface modification and ablation of polyimide (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 847-849 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-pulse laser ablation of polyimide was investigated by using focused UV-Ar+-laser radiation (λ(approximate)302 nm, 140 ns≤τl≤50 ms) and atomic force microscopy. The results clearly demonstrate that the ablation rates do not depend on the total dose only, but depend as well on the duration of the laser pulses, τl. The experimental results can be interpreted almost quantitatively on the basis of a purely thermal model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122021
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  • 3
    Electronic Resource
    Electronic Resource
    Patterning of YBa2Cu3O7-δ films using a near-field optical configuration (1998)
    Springer
    Applied physics 67 (1998), S. 403-405 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 07.79.Fc; 74.25.Fy; 74.76.Bz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 2 Cu3O7-δ films have been patterned by means of an arrangement employed in scanning near-field optical microscopy (SNOM). Standard SNOM probes were modified to achieve high transmission for direct writing by oxygen depletion in N2 atmosphere. The written lines are about 1.5 μm wide and show a semiconductor-like resistivity behavior (δ≥0.5). The morphology of illuminated regions is about the same as that of the YBCO films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050793
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  • 4
    Electronic Resource
    Electronic Resource
    Uniform target ablation in pulsed-laser deposition (1999)
    Springer
    Applied physics 68 (1999), S. 363-367 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 61.80.Ba; 42.62.Cf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 0 ∝t1/2. The best results are expected for a circular top-hat beam shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050905
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  • 5
    Electronic Resource
    Electronic Resource
    Film structure and ferroelectric properties of in situ grown SrBi2Ta2O9 films (1999)
    Springer
    Applied physics 69 (1999), S. 55-61 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 68.55.-a; 77.80.-e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Ferroelectric SrBi2Ta2O9 (SBT) films were grown by pulsed-laser deposition (PLD) at different substrate temperatures and fluences. A correlation between film structure and ferroelectric properties is established. The dielectric function ε′ of thin SBT films shows a Curie–Weiss behavior well below the peak temperature Tmax and relaxor-like behavior in the vicinity of Tmax. Domain walls have a strong influence on the dielectric and ferroelectric properties and on the polarization fatigue of SBT films below 100 °C. The formation of ferroelectric phases is favored at lower substrate temperatures by incorporating Bi2O3 template layers into the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050971
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  • 6
    Electronic Resource
    Electronic Resource
    Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products (1999)
    Springer
    Applied physics 69 (1999), S. S487 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62; 61.80; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Single-pulse excimer-laser irradiation of poly-ethylene-terephthalate (PET) with fluences around and above the ablation threshold leads to the formation of surface dendrites. The lateral size and the number density of dendrites depend on the laser wavelength and the type and pressure of the ambient atmosphere. The results are discussed on the basis of excimer-laser-induced polymer fragmentation and the redeposition of ablation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051447
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  • 7
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition (1999)
    Springer
    Applied physics 69 (1999), S. S45 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 73.50.-h; 81.15.Fg; 68.60.-p
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. In this paper we discuss some fundamentals on uniform target ablation and present some new results on thin films of high-temperature superconductors, ferroelectrics, and polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003399900178
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  • 8
    Electronic Resource
    Electronic Resource
    The role of excited species in ultraviolet-laser materials ablation III. Non-stationary ablation of organic polymers (1996)
    Springer
    Applied physics 62 (1996), S. 397-401 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 82.65; 82.50; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  The role of non-stationary effects in nano-second ultraviolet (UV) excimer-laser ablation of organic polymers is discussed. The model includes reversible changes in absorption related to darkening and bleaching effects. Comparison of calculations and experimental data for polyimide demonstrates that the photophysical model describes the ablation kinetics quite well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050316
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  • 9
    Electronic Resource
    Electronic Resource
    Oscillations in laser direct writing of W from WCl6 and H2: A theoretical analysis (1995)
    Springer
    Applied physics 61 (1995), S. 347-351 
    Details
    ISSN: 1432-0630
    Keywords: 42.62 ; 44.30 ; 61.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The origin of oscillations observed in laser direct writing of W lines on quartz substrates is studied on the basis of a one-dimensional model. The dependence of oscillations on laser power, scanning velocity, etc., is discussed. The predictions are compared with experimental data. The present approach can be applied also to other systems, where such oscillations have a different origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540106
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  • 10
    Electronic Resource
    Electronic Resource
    UV-laser-induced surface topology changes in polyimide (1996)
    Springer
    Applied physics 63 (1996), S. 337-339 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.60; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Surface topology changes in polyimide induced by single UV-laser pulses with pulse durations between 140 ns and 5 μs are investigated by means of atomic force microscopy. With increasing fluence three different regimes are found: (a) real material removal (ablation), (b) swelling of the irradiated area above the level of the untreated surface (hump formation) and (c) lowering of the irradiated area below the level of the untreated surface (dent formation). A detailed description of these topology changes is given and different formation processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050395
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