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  • 11
    Electronic Resource
    Electronic Resource
    Optical spectroscopy of semiconductor quantum wires (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1641-1650 
    Details
    ISSN: 0392-6737
    Keywords: III–V compounds and systems ; III–V semiconductors ; Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We investigated the optical properties of excitons in quasi-onedimensional semiconductor quantum structures by photoluminescence and photoluminescence excitation. High-quality GaAs/Al x Ga1−x As heterostructures were grown using low-pressure organometallic chemical vapour deposition (OMCVD) on non-planar substrates. The experimentally observed subband separations are in good agreement with a theoretical calculation of the quantum-confined eigenstates, which includes the mapping of the crescent-shaped wire obtained on TEM micrographs. Additionally, a temperature dependence study of excitonic spectra reveals the dominant role of potential and size fluctuations in localizing the excitons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457257
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  • 12
    Electronic Resource
    Electronic Resource
    Vectorial electromagnetic modes in V-shaped dielectric waveguides with application to quantum wire devices (1999)
    Springer
    Optical and quantum electronics 31 (1999), S. 797-812 
    Details
    ISSN: 1572-817X
    Keywords: optical waveguide ; quantum wire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The properties of V-shaped optical dielectric waveguides are investigated in detail using a vectorial finite element method. The fundamental modes exhibit extremely tight, heart shaped near field patterns. The maximum intensity of the fundamental mode is found to be vertically shifted with respect to the geometrical center of the waveguide. Fundamental and higher order mode properties are extensively studied, including mode patterns, dispersion curves and polarization properties. The local mode polarization of the two fundamental modes varies from a horizontal (vertical) orientation at the groove center to TM (or TE respectively) far in the side wings. The optimal design of waveguides for GaAs/AlGaAs quantum wire diode lasers and Quantum Confined Stark Effect modulators grown on V-grooved substrates is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006994729465
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  • 13
    Electronic Resource
    Electronic Resource
    Electronic states in hyperbolic-boundary crescent-shaped quantum wires (1999)
    Springer
    Optical and quantum electronics 31 (1999), S. 201-213 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A fully two-dimensional study of the electronic sub-bands in crescent-shaped quantum wires is presented. The confinement energies and the wave functions are compared by means of an aspect ratio to those produced by the adiabatic approximation. Guidelines for applying the adiabatic model are provided and the adiabatic quantum number classification scheme is discussed. “Non- adiabatic” states are determined among the first few sub-bands and a built-in dipole is identified. The energy spectrum is explored as a function of wire dimensions achievable by present-day technology. Wire parameters corresponding to maximized sub-band separations are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006994219896
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  • 14
    Electronic Resource
    Electronic Resource
    New lasers and laser schemes (1982)
    Springer
    Applied physics 29 (1982), S. 143-148 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusion We have demonstrated the existence of an anomalous polarization coupling mechanism present in the injection locked TEA CO2 laser. As a direct consequence of this work, a new injection technique has been formulated which permits efficient injection coupling and maximises energy extraction whilst eliminating the detrimental optical feedback effects to which other injection locking systems are prone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688654
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    Paper (German National Licenses)
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