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  • 1995-1999  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Longitudinal carrier density profiling in semiconductor lasers via spectral analysis of side spontaneous emission (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1904-1906 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A combined experimental and theoretical approach to measuring the variation in carrier density along the length of a semiconductor laser is developed. It is shown that by following the rate of increase of the principal spectral peak, rather than monitoring the optical power at a fixed energy, measurements can be made less susceptible to the effects of heating in the sample. Experimental results showing the development of the longitudinal carrier density profile with injected current are presented and, when compared with the results of self-consistent modeling, provide insights into the internal operating mechanisms of the laser. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Differential gain in coupled quantum well lasers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2962-2969 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we examine the effect of coupling between the wells on the differential gain. We find, as for the gain peak, the differential gain at the gain peak is not a monotonic function of the barrier thickness. For relatively thick barriers inclusion of coupling reduces the differential gain but as the barrier gets thinner the differential gain can be significantly enhanced or suppressed. We also compare our calculations with those for single quantum well to show how the enhancement in differential gain in the multi quantum well laser, due to reduced state filling and higher modal gain is affected by well coupling. Without losing generality, the model assumes the quantum well region to be electric field free. Numerical examples are presented for a GaAs/Al0.2Ga0.8As double quantum well system. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360043
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Second-Order Nonlinear Optical Langmuir-Blodgett Films Based on a Series of Azo Rare-Earth Coordination Compounds (1995)
    s.l. : American Chemical Society
    Chemistry of materials 7 (1995), S. 1047-1049 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00054a001
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental investigation of physical mechanisms underlying lateral current injection laser operation (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 285-287 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By comparing theoretical prediction with experimental performance, we gain insight into the physical operation of lateral current injection lasers. By studying the temperature dependence of lasing stimulated efficiency, we demonstrate the influence of lateral heterobarriers (achieved in this experiment by quantum well intermixing) on the confinement of carriers to the active region. By comparing the evolution of threshold current with temperature for devices of differing contact separations with a self-consistent model of lateral current injection laser operation, we reveal the importance of the interplay between the lateral material gain profile and the optical mode. Understanding these mechanisms, unique to the lateral injection family of lasers, is key to realizing the tremendous potential of this class of lasers to enable optoelectronic integration and novel functional devices. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121796
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  • 5
    Electronic Resource
    Electronic Resource
    Highly-ordered carbon nanotube arrays for electronics applications (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 367-369 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly-ordered arrays of parallel carbon nanotubes were grown by pyrolysis of acetylene on cobalt within a hexagonal close-packed nanochannel alumina template at 650 °C. The nanotubes are characterized by a narrow size distribution, large scale periodicity, and high densities. Using this method ordered nanotubes with diameters from 10 nm to several hundred nm and lengths up to 100 μm can be produced. The high level of ordering and uniformity in these arrays is useful for applications in data storage, field emission displays and sensors, and offers the prospect of deriving computational functions from the collective behavior of symmetrically coupled nanotubes. The fabrication method used is compatible with standard lithographic processes and thus enables future integration of such periodic carbon nanotube arrays with silicon microelectronics. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124377
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  • 6
    Electronic Resource
    Electronic Resource
    On the interaction of solitary waves of flexure in elastic rods (1995)
    Springer
    Acta mechanica 110 (1995), S. 173-182 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A numerical study is made to determine whether the partial differential equations governing planar, twist-free motions in a theory of the dynamics of elastic rods are completely integrable in the sense of soliton theory. The theory in which the equations arise is due to Kirchhoff and Clebsch and is complete to within an error of order two in an appropriate dimensionless measure of thickness and strain. A recently developed energy-preserving finite-difference scheme is employed to determine the consequences of the interaction of solitary traveling waves, which, in the present twist-free case, are loops traveling at constant speed. It is found that the change induced in such a loop-wave upon collision with another is more than a shift in phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01215423
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    An effective nonlinear boundary condition for a corroding surface. Identification of the damage based on steady state electric data (1998)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 49 (1998), S. 656-679 
    Details
    ISSN: 0044-2275
    Keywords: Key words. Corrosion modeling, rough surfaces, impedance tomography.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract. We give a formal derivation of an effective nonlinear boundary condition associated with a steady state voltage potential on a corroding metal surface. Subsequently we use this boundary condition to analyze the determination of corrosion damage based on measurements of the boundary voltage potential and the associated current flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000000050114
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    Paper (German National Licenses)
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