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Interface, Guided and Non-Localized Modes in Superlattices

100%
Brazis R., Narkowicz R., Safonova L.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
333-336
EN
The numerical dispersion calculations in long-period GaAs/AlAs super-lattice were performed using a local theory with retardation as well as an ef­fective medium approximation. The splitting of the dispersion branches near the transverse optical phonon frequencies and phonon-like to photon-like modes transition were found to depend on the superlattice spatial period. The characteristic frequencies of bulk modes and crossing point of disper­sion branches estimated analytically with the use of an effective medium approximation were found to agree with the results of rigorous solution.
2
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In-Plane Propagating Coupled Photon-Phonon-Magnetoplasmons, their Field Structure and Dispersion in GaAs/AlAs Superlattices

100%
Brazis R., Narkowicz R., Safonova L.
Acta Physica Polonica A
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1995
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vol. 88
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issue 4
687-690
EN
The dispersion and field structure of in-plane propagating p-polarized waves in n-GaAs/AlAs superlattice is studied in the frequency range below 10 THz in the presence of the steady magnetic field which is perpendicu­lar both to the direction of propagation and periodicity. The existence of non-localized photon-phonon-plasmon modes as well as the magnetic-field­-controlled mode localization at selected set of interfaces is predicted.
3
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Transmission and Reflection of Millimeter Waves in i-GaAs/n-GaAs Periodic Structures in Voigt Configuration

100%
Narkowicz R., Brazis R., Safonova L.
Acta Physica Polonica A
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1997
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vol. 92
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issue 5
929-934
EN
The paper presents the first experimental results on the in-plane propagation of millimeter waves in GaAs ...n-i-n-i-... type periodic layered structures in the Voigt geometry. The data are found to agree with theoretical calculations based on the effective medium approximation, showing the feasibility of contactless non-destructive probing of periodic layered structures.
4
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Optical Properties of Cd_{1-x}Mn_xTe Crystals near Fundamental Absorption Edge in Transverse Magnetic Fields

100%
Safonova L., Brazis R., Narkowicz R.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
267-270
EN
A simple and convenient model is proposed to elucidate the optical characteristics of Cd_{1-x}Mn_xTe crystals using experimental data on light reflection in magnetic field. The model is based on the quasi-oscillator concept accounting both for the exciton and fundamental absorption edge contributions. The energy dependencies of refraction index and absorption coefficient are presented for Mn mole fraction x=20% at the magnetic field values up to 5 T.
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