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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of geometric effects for the guide/antiguide intensity modulator (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4455-4457 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The characteristics of geometric dimensions, such as the modulation length L, the central guide width W, and the gap G between the central guide and antiguide regions for the performance of the guide/antiguide intensity modulator have been examined. Both theoretical predictions and experimental measurements are reported here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352186
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  • 2
    Electronic Resource
    Electronic Resource
    120-K Tl-based high-Tc superconducting thin films on LaAlO3 substrates (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3952-3954 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The preparation and properties of 120-K Tl-based high-temperature superconducting thin films on LaAlO3 substrates are reported. These films are obtained by post-annealing 2Tl: 2Ca: 2Ba: 3Cu: 10O precursor films at (approximately-equal-to)890 °C in a sealed quartz tube filled with (approximately-equal-to) 1-atm O2. Results of ac susceptibility measurements show a sharp drop in the real part of the susceptibility (χ') and a sharp maximum peak in the imaginary part of the susceptibility (χ‘) at a temperature close to the observed zero resistance Tc of (approximately-equal-to) 120 K. The broadening of the transition width in χ' and the decrease in the temperature where χ‘ maximum appears are found to occur at a slower rate with increasing ac field for these films than for the films deposited on Y-ZrO2 and MgO and having a similar zero resistance Tc. This weaker field dependence of χ' and χ‘ is shown to lead to a higher critical current density for the films deposited on LaAlO3 substrates. The higher critical current density is attributed to a stronger coupling between the grains arising from the absence of the formation of well-defined grain boundaries during film growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349208
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  • 3
    Electronic Resource
    Electronic Resource
    High-contrast, large optical bandwidth field-induced guide/antiguide modulator (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2211-2213 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report an electric field induced-guide/antiguide optical intensity modulator which has a very wide optical bandwidth from 1 to 1.55 μm (ON/OFF ratio (approximately-greater-than) 13 dB from 1 to 1.55 μm for both TE and TM modes), which is the largest ever reported before for an intensity modulator. A TE mode ON/OFF ratio larger than 21 dB at 1.15 μm, and a propagation loss ∼1 dB at 1.3 μm has been measured. The electro-optic effects, along with carrier effects have been exploited to increase the refractive index under the guide and adjacent antiguide electrodes by applying reverse biases to them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104929
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  • 4
    Electronic Resource
    Electronic Resource
    Structural phase transformation in the superconducting YLaxBa2−xCu3O7 compounds (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1901-1903 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An orthorhombic-to-tetragonal phase transformation in YLaxBa2−xCu3O7 has been observed as a function of x, but with the same oxygen concentration, from x-ray powder diffraction data. Compounds with x≤0.37 have Tc in the 93–53 K range and are orthorhombic, while compounds with x≥0.45 have Tc≤42 K and are tetragonal. An analysis of the YLa0.6Ba1.4Cu3O6.99 diffraction pattern suggests that the tetragonal structure is closely related to those of the orthorhombic YBa2Cu3O7 and the tetragonal YBa2Cu3O6 with a partial substitution of La3+ ion on the Ba2+ site and a disorder of oxygen atoms at the midpoints of both a and b unit cell edges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99738
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallography and microstructure of Tl-Ca-Ba-Cu-O superconducting oxides (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 432-434 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the crystallography and microstructure of six oxides in the Tl-Ca-Ba-Cu-O system with nominal compositions Tl1Ba2Cu1O5, Tl1Ca1Ba2Cu2O7, Tl1Ca2Ba2Cu3O9, Tl2Ba2Cu1O6, Tl2Ca1Ba2Cu2O8, and Tl2Ca2Ba2Cu3O10. The structures consist of one, two, or three Cu perovskite-like units sandwiched between Tl-O monolayers or bilayers. The predominant defects in the crystals with bilayer and trilayer Cu perovskite-like units are stacking faults that produce local intergrowths of related structures. The density of stacking defects in these oxides correlates with changes in the superconducting transition temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100611
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  • 6
    Electronic Resource
    Electronic Resource
    GaAs/AlGaAs multiple quantum well field-induced optical waveguide (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 114-116 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrically controllable optical waveguides have been created by using only the increase in refractive index from linear and quadratic electro-optic effects in GaAs/AlGaAs multiple quantum well substrates for the first time. Unlike conventional fixed waveguides, lateral guiding of this field-induced guide (FIG) can be turned on and off, so that the confinement factor, propagation constant, and net loss can be adjusted over wide ranges electrically. This special property plus a very simple fabrication process suggest that the FIG could be an important base technology for photonic integrated circuits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103959
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  • 7
    Electronic Resource
    Electronic Resource
    Impurity-induced-disordered phase modulators in AlGaAs/GaAs quantum well and double-heterostructure waveguides (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 728-730 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results for two new channel waveguide phase modulators formed by impurity-induced disordering (IID) with Zn diffusion in AlGaAs/GaAs are presented. One device utilizes side diffusion into ridges of single quantum well material and the other utilizes surface diffusion into double-heterostructure material. Waveguide loss for both TE and TM polarizations, and effective index steps calculated from observed mode profiles are reported. TE/TM mode conversion was observed without bias under certain conditions. Initial results for phase modulation are in agreement with expectations and appear not to be affected by the IID.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99816
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  • 8
    Electronic Resource
    Electronic Resource
    Superconducting Tl-Ca-Ba-Cu-O thin films with zero resistance at temperatures of up to 120 K (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 329-331 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared superconducting Tl-Ca-Ba-Cu-O thin films on a variety of substrates with transition temperatures as high as (approximately-equal-to)120 K, confirmed by sharp onsets of substantial Meissner and shielding signals at the same temperatures. The properties of the films are found to depend sensitively on the post-annealing conditions. Highly textured c-axis-oriented films comprised mostly of Tl2Ca1Ba2Cu2Ox, Tl1Ca2Ba2Cu3Ox, and Tl2Ca2Ba2Cu3Ox were synthesized by varying the annealing procedure with corresponding maximum superconducting transition temperatures of (approximately-equal-to)100, 110, and 120 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100599
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  • 9
    Electronic Resource
    Electronic Resource
    Surface-oxidation-induced phase separation in FeMn thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5667-5669 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Films of Fe50Mn50, 700 A(ring) thick, were deposited on glass substrates by diode rf sputtering. Auger electron spectroscopy, and x-ray fluorescence analysis verified the film composition and x-ray diffraction determined the crystalline phase to be α-Mn(Fe), a complex bcc-like structure and a considerable deviation from that dictated by the equilibrium binary phase diagram. The films were annealed for 1 h at 260 °C and 10−7, 10−5, and 10−2 Torr. Auger depth profile analysis showed that (a) while no further oxidation (than that induced by ambient exposure) occurred during annealing at the lowest pressure, severe film oxidation took place at the highest pressure and (b) preferential surface oxidation of Mn resulted in a layered structure consisting of a surface Mn- and oxygen-rich layer followed by a region (deeper into the film) depleted in Mn and Fe enriched. The crystalline phases present were determined by x-ray diffraction analysis to be MnO (fcc) and α-Fe(Mn) (bcc). Magnetic measurements of the oxidized films revealed that they displayed in-plane isotropic ferromagnetic properties, with 4πMs∼15–18 kG for the most extensively oxidized films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342268
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  • 10
    Electronic Resource
    Electronic Resource
    Line-broadening analysis of synchrotron x-ray diffraction data (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2813-2816 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The advantages of using monochromatic and parallel synchrotron x rays for the microstructure analysis of polycrystalline materials have been studied. Analysis of line broadening from Pd powers showed encouraging results. Warren–Averbach analysis [J. Appl. Phys. 21, 595 (1950)] with respect to the three major crystal axes [111], [100], and [110] was done using 1-A(ring) x rays. Crystallite sizes and microstrains relative to the [111] direction were obtained using three different reflection pairs (111)-(222), (111)-(333), and (111)-(444). The fixed symmetrical instrument profile shape has major advantages in the correction of instrumental broadening and the determination of a low level (10−4 range) of stacking-fault probabilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337872
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