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  • Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds)  (2)
  • General theory  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Non-linear optics of hybrid excitons in organic-inorganic nanostructures (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1555-1559 
    Details
    ISSN: 0392-6737
    Keywords: Nonlinear optics ; Optical properties of thin films, surfaces, and thin layer structures (including superlattices, heterostructures, and intercalation compounds) ; Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; Excitons and related phenomena (including electron-hole drops) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary In a system comprising an organic layer coupled to a semiconductor layer, if the energy of the Frenkel exciton in the first is close to that of the Wannier exciton in the second, the lowest electronic excitations can be described as hybrid resonances. These new excitons give rise to very pronounced optical non-linearities because they have at the same time large oscillator strengths, typical of Frenkel excitons, and large radii, typical of Wannier excitons. The results of a microscopic calculation of the optical properties of such a system are presented and discussed: compared with the usual semiconductor quantum wells, enhancements of two orders of magnitude both in the size of the susceptibility (linear part) and in its relative change with increasing excitation density (Kerr non-linearity) are predicted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457243
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  • 2
    Electronic Resource
    Electronic Resource
    Exciton-photon coupling in GaAs bulk microcavities (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1747-1751 
    Details
    ISSN: 0392-6737
    Keywords: Polaritons (including photon-phonon and photon-magnon interactions) ; Excitons and related phenomena (including electron-hole drops) ; Quantum optics ; 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 A great interest in the study of exciton-photon coupling in resonant optical media such as semiconductor microcavities is currently developing both in experiments and in theory. We investigate the spectral response of a new semiconductor quantum system in which the cavity material itself is the active medium. If the Fabry-Perot quasi-mode is carefully tuned on the excitonic transition of the cavity bulk material, strong exciton-photon coupling takes place and produces new features such as a Rabi-like splitting as large as that observed in quantum well microcavities and comparable optical absorption. In addition, the polaritonic spatial dispersion and the quantization of the centre-of-mass motion introduce remarkable fine structures which are absent in the quantum well case. We demonstrate the above effects from a spectroscopic analysis of GaAs cavities, using standard reflectance and photoluminescence techniques. The experimental results are further clarified with theoretical calculations performed with an adapted transfer-matrix approach. The case of semi-cavities is finally considered and a new way to control the exciton-photon interaction in our system is achieved tailoring the photonic wave function with a change in the reflectivity phase of the mirrors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457274
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  • 3
    Electronic Resource
    Electronic Resource
    A nonlinear sum rule for atomic hydrogen (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 873-880 
    Details
    ISSN: 0392-6737
    Keywords: General theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A sum rule for the nonlinear absorption of a probe beam induced by an external light beam is derived for the H atom. Numerical calculations are carried out using the pseudostate summation method and the consistency of the calculation is verified by comparing the length and the velocity gauge. The results confirm the validity of the pseudostate summation method in perturbation theory and give a measure of the strength of nonlinear effects in atomic hydrogen. They are shown to increase by orders of magnitude with increasing the frequency of the external beam. Asymmetries in the nonlinear absorption are expected, with larger negative contributions on the high-frequency side of the spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451673
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