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  • 1
    ISSN: 1432-0630
    Keywords: 68.55 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Laser-assisted evaporation is an emerging novel thin film deposition technique. It has been successfully applied to a variety of dielectric and semiconductor materials. Characteristics of the evaporation process and of the evaporants, resulting from the interaction of high power radiation with matter, often result in better structural and chemical properties of the films than can be obtained by conventional evaporative techniques. Congruent evaporation, the presence of energetic vapor species, and precise rate control are important advantageous features of this technique. The physics of laser-induced evaporation and plasma formation, some engineering aspects, and properties of dielectric and semiconductor thin films deposited by this technique are discussed in this review.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Keywords: PACS: 68.60; 81.15 ; 68.55
    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 properties of Pulsed-Laser-Deposited Diamond-Like Carbon (PLD DLC) films are studied as functions of the power density Φ and the wavelength λ of the laser beam, and the incident angle ϑ of the beam relative to the normal of the target surface. All the films have a similar structure consisting of graphite particulates embedded in a continuous matrix, so the macroscopic performance of the films is determined by the overall contributions of the particulates and the matrix. The use of higher Φ, shorter λ, or larger ϑ leads to an enhancement of the diamond-like characteristics and a simultaneous increase of the particulate density. These two effects give opposite contributions to the electrical conductivity σR, leading to the following results. (i) σR drops with increasing Φ in the low Φ range (region I) due to the stronger diamond-like nature of the matrix, but increases sharply after Φ has exceeded a threshold Φmin as a result of the rapid increase in particulate density. (ii) In region I, the use of shorter λ or larger ϑ leads to a more diamond-like matrix, and this overwhelms the degradation effect caused by the slight increase in particulate density. The samples thus become more insulating. In the high Φ region (region II), however, the use of shorter λ or larger ϑ gives rise to higher particulate density, thereby increasing the electrical conductivity.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0630
    Keywords: 68.60 ; 81.15 ; 68.55
    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 properties of Pulsed-Laser-Deposited Diamond-Like Carbon (PLD DLC) films are studied as functions of the power densityΦ and the wavelengthλ of the laser beam, and the incident angleϑ of the beam relative to the normal of the target surface. All the films have a similar structure consisting of graphite particulates embedded in a continuous matrix, so the macroscopic performance of the films is determined by the overall contributions of the particulates and the matrix. The use of higherΦ, shorterλ, or largerϑ leads to an enhancement of the diamond-like characteristics and a simultaneous increase of the particulate density. These two effects give opposite contributions to the electrical conductivityσ R, leading to the following results. (i) σR drops with increasingΦ in the lowΦ range (region I) due to the stronger diamond-like nature of the matrix, but increases sharply afterΦ has exceeded a thresholdΦ min as a result of the rapid increase in particulate density. (ii) In region I, the use of shorterλ or largerϑ leads to a more diamond-like matrix, and this overwhelms the degradation effect caused by the slight increase in particulate density. The samples thus become more insulating. In the highΦ region (region II), however, the use of shorterλ or largerϑ gives rise to higher particulate density, thereby increasing the electrical conductivity.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Complex conductivities of YBa2Cu3O7 high-temperature superconducting thin films were measured from 80 to 111 GHz using quasi-optical techniques. From transmission measurements, a peak was obtained in σ1 versus temperature. Measurements of the frequency dependence of this peak position found it shifted to higher temperatures with increasing frequency. The data for both σ1 and σ2, as a function of frequency, were fitted using a BCS/effective medium model. This fit indicates that the observed peak in σ1 is a result of the temperature dependence of the carrier mean free path combined with effects resulting from the granularity of the films.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2026-2028 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first mm wave passive component made with high temperature superconducting thin films. Microstrip bandpass filters, with bandwidth of 2.2 GHz and a center frequency of 55 GHz, were made using YBa2Cu3O7−x filter patterns on MgO substrates with Au ground planes. The best results were obtained for a film grown with a thin SrTiO3 buffer layer and had Tc=89 K and Jc=106 A/cm2 at 84 K. The filter showed insertion loss of 1.7 db at 77 K, and 1.5 db at 70 K, compared to 7.3 db for Au filters at 77 K. Subtracting the losses in the Au ground plane, we estimated that the superconductor surface resistance is lower than one fourth that of Au at 77 K and 55 GHz.
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  • 6
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Far-infrared magnetotransmission experiments were carried out on two Hg1−xCdxTe superlattices with graded composition grown by laser molecular beam epitaxy. A superlattice k⋅p model was used to calculate the subband structures of the superlattices. Good agreement is found between the experimental results and the theory if the valence-band offset is assumed to be small.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 310-312 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser molecular beam epitaxy offers instantaneous and accurate composition and thickness control that was used successfully to grow HgCdTe-based superlattice structures with rectangular, trapezoidal, triangular, and sawtooth-shaped quantum wells. Their structures were characterized with cross-sectional transmission electron microscopy and low-temperature Auger depth profiling.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1940-1942 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very high surface temperature can be reached by exposing CdTe to intense laser radiation. Under this condition, the evaporation is dissociative to form a mixture of Cd, Te, and Te2. The fraction of atomic Te can be varied by changing the laser power, thus allowing a systematic elucidation on the role of atomic Te in the growth kinetics of (111) CdTe homoepitaxy. In comparison with Te molecules, the use of Te atoms improves the surface morphology of layers grown on the (111)A face and enhances the growth rate on both the (111)A and (111)B faces. Results suggest that the atomic Te is more reactive.
    Type of Medium: Electronic Resource
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