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  • 1
    Digitale Medien
    Digitale Medien
    Interband tunneling in nonparabolic semiconductors in the presence of an electric field (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3246-3250 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An attempt is made to study the interband tunneling rate for small-gap semiconductors having Kane-type energy bands in the presence of an external electric field, taking InSb as an example for the purpose of numerical computations. The experimentally obtained tunneling currents, which may not be limited by the factor 2, can be better explained by this formulation. Thus, the present analysis is applicable for wider ranger of electric fields and are more consistent with the experimental results than that previously proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.354599
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  • 2
    Digitale Medien
    Digitale Medien
    Studies of bonding and valence states in YBa2Cu3O7−x through secondary-ion-mass spectrometry (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2429-2432 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The superconducting compound YBa2Cu3O7−x (YBCO) and oxides of copper (CuO and mixture of CuO and Cu2O) have been examined by secondary-ion-mass spectrometry (SIMS). The results support the fact that two kinds of copper (from the consideration of bonding and valence state) exist in YBCO—one in the basal planes of charge reservoir layers and the other in the conduction layers. The bonding of Cu-O in the CuO2 conduction layer unit is similar to that in CuO. No Cu+++ secondary ions could be detected in the SIMS spectrum, in agreement with electron spectroscopy for chemical analysis, extended x-ray-absorption fine structure, and electron probe microanalysis measurements reported earlier. A plausible explanation has been given for this.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.353098
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  • 3
    Digitale Medien
    Digitale Medien
    A study of interband magneto-optical transition in semiconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2086-2088 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An attempt is made to study the magneto-optical absorption for direct band parabolic semiconductors considering the k¯ dependence of the optical matrix element. Thus we have obtained the generalized expressions for the same coefficients which are consistent with the experimental results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351645
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  • 4
    Digitale Medien
    Digitale Medien
    Theoretical analysis of interband optical absorption in an external electric field (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1075-1081 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We study theoretically the interband optical absorption coefficient of semiconductors described within the two-band Kane model in the presence of an external electric field for photon energy below and above the semiconductor band gap. The optical matrix element depends on the momentum vector, and this important aspect has been incorporated in the present analysis. For photon energies below the band gap, the absorption coefficient exhibits an exponential falloff with the electric field and the photon energy. For the opposite inequality, the same coefficient oscillates with the photon energy without consideration of the Wannier–Stark levels, which generally exists in a band due to the presence of an external electric field. Additional oscillations are expected in the above two cases because of the formation of the discrete Stark ladders. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1330253
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  • 5
    Digitale Medien
    Digitale Medien
    Secondary-ion-mass spectrometry and near-field studies of Ti:LiNbO3 optical waveguides (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5345-5350 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Secondary-ion-mass spectrometry (SIMS) and near-field (NF) methods have been applied to study Ti:LiNbO3 optical waveguides. Ti concentration as a function of diffusion process parameters has been studied by the SIMS method. The main determining factors that were found to affect the depth-diffusion behavior of titanium in LiNbO3 slab waveguides are the initial thickness of the dopant film and the diffusion temperature. Anisotropy in the diffusion rate for Xand has been applied to the refractive index profile reconstruction for single-mode optical channel waveguides. A sharp change in the index at the air–guide interface has been observed, as expected. The dependence of refractive index change on Ti concentration has been found to be nonlinear, such as quadratic, approximately. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359713
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  • 6
    Digitale Medien
    Digitale Medien
    Chromium diffusion in lithium niobate for active optical waveguides (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2193-2197 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A method to fabricate chromium-doped lithium niobate substrates in which the active ions are introduced by thermal diffusion from a film is reported. Chromium concentration depth profiles have been obtained by secondary-ion-mass spectrometry and the relevant diffusion parameters have been derived. Fluorescence spectrum and upper laser level lifetime of chromium diffused proton-exchanged and chromium/titanium-diffused lithium niobate waveguides have been measured. A simple model has been used to estimate the performance of such structures as waveguide optical amplifiers and lasers. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360134
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  • 7
    Digitale Medien
    Digitale Medien
    Studies of binding energies of various components in bismuth-based cuprate superconductors through secondary ion mass spectrometry and x-ray photoelectron spectroscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 343-349 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Surface analysis of bismuth-based high-Tc superconductors, like Bi2Sr2CaCu2O8+δ (Bi-2212) and Bi2Sr2Ca2Cu3O10+δ (Bi-2223) has been carried out by secondary ion mass spectrometry and x-ray photoelectron spectroscopy techniques. The results have been compared with that of similar measurements on Bi2O3, CuO, and CaCO3 samples so as to have detailed information about the surface binding energy as well as the chemical nature of the various individual components that exist inside these high-Tc compounds. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359327
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  • 8
    Digitale Medien
    Digitale Medien
    Characterization and optimization of Ti-diffused LiNbO3 optical waveguides by second diffusion of magnesium (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 187-193 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Mg diffusion in Ti-diffused LiNbO3 (Ti/Mg:LiNbO3) optical waveguides has been studied. Secondary ion mass spectrometry has been used to obtain Ti/Mg dopant concentration profiles. Comparison of the diffusion behavior of Mg in pure LiNbO3 and titanium-diffused LiNbO3 (Ti:LiNbO3) has been made. A numerical study, based on semivectorial finite difference method to determine the coupling loss between single-mode fibers and Ti/Mg:LiNbO3 optical waveguides has been performed. It has been demonstrated that the use of Mg can reduce the asymmetry-induced coupling loss to almost zero. A method that predicts the best relative position of the fiber axis with respect to the surface of Ti/Mg:LiNbO3 waveguides has been presented. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360650
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  • 9
    Digitale Medien
    Digitale Medien
    A secondary-ion-mass spectrometry study of magnesium diffusion in lithium niobate (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7552-7558 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A detailed study of magnesium indiffusion in lithium niobate (LiNbO3) crystal is presented. The aim of the work was to obtain a comprehensive understanding of the diffusion process as a function of film thickness, temperature, diffusion time, crystal cut-direction. The secondary-ion-mass spectrometry technique was employed to obtain magnesium concentration depth profiles. Our results show that the strongest factor that controls the diffusion process is the temperature. A noticeable increase of the diffusion coefficient is observed with increasing temperature. The diffusion time has a small effect on the diffusion coefficient, but if the former is less than a certain value, the deposited MgO film does not diffuse completely. On the other hand, if it is quite long it will enter into the annealing regime. Diffusion parameters to realize buried waveguides (which reduce the coupling loss between single-mode fibers and diffused waveguides) have also been derived. The present studies could be important in consideration of the synthesis of LiNbO3 optical devices with improved optical qualities. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357988
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  • 10
    Digitale Medien
    Digitale Medien
    Conduction-band tailing in parabolic band semiconductors (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3328-3333 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Kane's [Phys. Rev. 131, 79 (1963)] model for the density of states for energies in the band gap is in qualitative agreement with experiment. Halperin and Lax [Phys. Rev. 148, 722 (1966)] have also suggested a model for band tailing, which is applicable to the deep tailing states. In the present study, theoretical models have been proposed for the band tailing in the case of heavily doped semiconductors that are more general than those of Kane and others. In addition, the present study also offers an E-k¯ dispersion relation for band tails in the parabolic band based on Kane's semiclassical theory. This study has helped us to obtain a different model for the density of states in the band-tailing conditions and the model is expected to agree better with experiment. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365642
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