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  • 1
    Electronic Resource
    Electronic Resource
    Coherent and incoherent dynamics of excitons in semiconductor microcavities (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1295-1303 
    Details
    ISSN: 0392-6737
    Keywords: Polaritons (including photon-phonon and photon-magnon interactions) ; Excitons and related phenomena (including electron-hole drops) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have investigated the dynamics of impulsively excited planar microcavities in the strongly couple regime. With resonant, coherent excitation, the emitted light shows vacuum-Rabi oscillations and a lifetime corresponding to twice the cavity lifetime. As the light intensity is increased, the exciton bleaching leads to reduced normal-mode splitting. The role of interface disorder on the dynamic splitting is discussed. Coherence transfer in exciton-exciton scattering is observed. Off-resonant excitation leads to long lifetimes limited by scattering into the radiatively coupled states of the exciton-cavity system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457201
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  • 2
    Electronic Resource
    Electronic Resource
    Coherent exciton-photon dynamics in single, double, and quintuple quantum wells (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1769-1774 
    Details
    ISSN: 0392-6737
    Keywords: Optical transient phenomena (including quantum beats, dephasings and revivals, photon echoes, free induction decay, and optical nutation) ; Excitons and related phenomena (including electron-hole drops) ; Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have studied experimentally the coherent exciton-photon dynamics in a single, a double, and a quintuple quantum well structure under resonant excitation. In pump and probe experiments we observe an initial fast decay of the exciton population. This initial decay depends on the number of quantum wells. The population decay is accompanied by a coherent light emission induced by the first-order polarization, the intensity of which increases quadratically with the quantum well number. Interference effects and electromagnetic coupling effects between polarizations located in distinct quantum wells probably play a crucial role in the superlinear coherent emission process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457278
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  • 3
    Electronic Resource
    Electronic Resource
    The effects of crystallography and lateral intermixing on the subband structure and optical anisotropy in quantum-wire arrays on vicinal substrates in the layer-orbital model (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 867-875 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Materials-characterization studies indicate a high degree of lateral intermixing in quantum-wire arrays grown on vicinal substrates. In this study, the layer-orbital model, which is a variation of the effective bond-orbital model, is used to calculate the zone-center conduction- and valence-subband energies and optical matrix elements of recently grown epitaxially buried GaAs/AlGaAs/AlAs quantum wires and quantum-wire arrays. The lateral intermixing effect is included using a compositional profile that has the merit that it is appropriate for the entire range of lateral intermixing, whether small or large, and that is computationally efficient. The effect of the orientation of the quantum wires on the subbands and the optical matrix elements is also investigated. For uncoupled quantum wires, the orientation mainly affects the positions of the valence subbands; the optical matrix elements are nearly independent of the orientation. The situation for the quantum-wire array is more complicated due to its intermediate nature between one and two dimensional. It is found that only the position of the light-hole subband is appreciably affected. It is also found that quantum-wire arrays misoriented from the [011] ([01¯1]) direction display somewhat reduced optical anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349650
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  • 4
    Electronic Resource
    Electronic Resource
    Theory of optical anisotropy in quantum-wire arrays on vicinal substrates (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2685-2687 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective bond-orbital model is used to calculate the conduction- and valence-subband structures and optical matrix elements of recently grown epitaxially buried GaAs/AlGaAs/AlAs quantum-wire arrays. Band mixing, band anisotropy, and lateral intermixing of Ga and Al during growth strongly affect the energy levels and features in the optical data. Strong anisotropy in the optical properties is predicted for the case of perfect lateral interfaces while for cases with significant lateral intermixing, the optical properties show weak anisotropy. Our results are compared with the observed photoluminescence excitation spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348666
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  • 5
    Electronic Resource
    Electronic Resource
    Subband structures of semiconductor quantum wires from the effective bond-orbital model (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 161-168 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective bond-orbital model is used to calculate the subband structures of GaAs/AlGaAs and InGaAs/InP quantum wires of various geometries. The advantages of the effective bond-orbital model over standard effective-mass theory are its flexibility to accommodate otherwise awkward geometries, the straightforward manner in which boundaries between materials are treated, and the inclusion in the Hamiltonian of terms in k higher than quadratic. We focus our attention on the subband structures of epitaxially buried Ga0.47In0.53As/InP quantum wires of triangular cross section with axis in the [011] direction and (111), (11¯1¯), and (100) faces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347109
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  • 6
    Electronic Resource
    Electronic Resource
    Picosecond dynamics of terahertz-sideband generation in far-infrared illuminated quantum wells (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3176-3178 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical excitation of a quantum well illuminated by a strong far-infrared (FIR) field is known to give rise to sidebands on the optical spectra separated from the fundamental by multiples of twice the FIR frequency Ω. In this study, we consider the picosecond dynamics of terahertz (THz) sideband formation using picosecond optical excitation pulses. We find that the emission at the THz sidebands largely tracks the temporal evolution of the excitation pulse. Applications to wavelength-division multiplexing are discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126621
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  • 7
    Electronic Resource
    Electronic Resource
    Semiclassical theory of terahertz multiple-harmonic generation in semiconductor superlattices (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3536-3538 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A semiclassical theory is used to describe the emission of multiple electromagnetic harmonics in the terahertz (THz) regime due to coherent frequency-modulated Bloch oscillations in a superlattice driven by a strong THz field. A cutoff frequency to the harmonics linear in the applied THz field strength but independent of modulation frequency is predicted. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125380
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  • 8
    Electronic Resource
    Electronic Resource
    Terahertz-sideband generation in a semiconductor optical amplifier (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1805-1807 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that in a semiconductor optical amplifier irradiated by a strong terahertz electromagnetic field, terahertz-sideband generation can be substantial. Applications for frequency-shifting devices for wavelength-division-multiplexed optical systems are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1356456
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  • 9
    Electronic Resource
    Electronic Resource
    Terahertz pulse-induced switching of a quantum-well optical amplifier (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3872-3874 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate theoretically that an intense half-cycle terahertz pulse can be used conjunctively with a quantum-well optical amplifier to form the basis of an efficient ultrahigh-speed optical switch. Our procedure implies terahertz and subterahertz switching and recovery rates, respectively. Constraints and practicalities are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122921
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  • 10
    Electronic Resource
    Electronic Resource
    Waveguiding without a waveguide: Local-mode exciton polaritons in multiple quantum wells (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 994-996 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exciton polaritons are considered in infinite multiple quantum wells which are periodic except that one well (impurity) has a different well width from the others (host). Under certain circumstances it is possible to have a long-lived exciton-polariton mode localized about the impurity. From the viewpoint of the electromagnetic field, this corresponds to waveguide modes in the vicinity of an exciton resonance in such structures. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113823
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