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  • Articles  (922)
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  • 1
    Electronic Resource
    Electronic Resource
    Single variant ordering in GaInAs/InP (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2127-2129 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spontaneously ordered Ga0.47In0.53As grown on substrates with the (001) surface tilted 4° towards {111}B are studied using spectroscopic methods as well as x-ray diffraction, transmission electron diffraction and dark-field transmission electron microscopy. The single variant ordering is proved by the absence of one class of the ordering induced 〈fraction SHAPE="CASE"〉12{111}B superlattice spots in transmission electron diffraction patterns as well as by the tilted polarization of the photoluminescence emerging from the samples cleaved edge. The temperature dependence of the luminescence peak position shows an anomalous behavior at low temperatures and a strong dependence of the peak position on the excitation power. From low temperature absorption measurements, we find a band gap reduction of 37 meV and a valence band splitting of 13.2 meV. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119357
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  • 2
    Electronic Resource
    Electronic Resource
    Valence-band splitting and band-gap reduction in ordered GaInAs/InP (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6196-6198 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the linear absorption and the nonlinear absorption due to the bleaching of the excitonic resonance have been used to determine the band-gap reduction and valence-band splitting in spontaneously ordered GaInAs/InP. Tilts of the substrate ranging from 2° to 15° towards {111}B, different growth rates and temperatures have been used to produce a series of samples containing various degrees of ordering. Best sample quality including small x-ray and photoluminescence linewidth as well as low temperature luminescence from the band edge was obtained using a substrate tilted 6° towards {111}B. The ratio between ordering induced band-gap reduction and crystal-field splitting was found to be ζ=1.8±0.4. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367493
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  • 3
    Electronic Resource
    Electronic Resource
    Intrinsic modulation bandwidth of strained GaInP/AlGaInP quantum well lasers (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 650-652 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the intrinsic modulation response of GaxIn1-xP/AlGaInP quantum well lasers. The differential gain resulting from the measurement of the frequency response, is in good agreement with calculations based on a 6-band kp-theory and direct measurements of the optical gain. We find a maximum value of 3.8×10−16 cm2 for a strongly compressively strained sample, which is less than in InGaAs lasers according to the larger effective masses. The maximum bandwidth we observed is 9.3 GHz at −3 dB. We show that the bandwidth is limited by catastrophic optical damage and not by intrinsic mechanisms. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119818
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  • 4
    Electronic Resource
    Electronic Resource
    Tunable polarization converter based on ordered AlGaInP waveguide structures (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2225-2227 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An electrically tunable transverse electric/transverse magnetic polarization converter using ordered AlGaInP waveguide structures is presented. The structures are grown on (001) GaAs substrates with the surface tilted 6° towards {111}B. This selects one of the two possible {111}B variants for the ordering planes. Thus, also on a macroscopic scale, the symmetry of the planar waveguide is broken. The properties of the guided modes are very sensitive to the size and orientation of the axes of the dielectric tensor. So a slight modification of their magnitudes due to electrorefraction leads to a remarkable change in the propagation constants. This change is used to accomplish tunable rotation of polarization by 90°. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117173
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  • 5
    Electronic Resource
    Electronic Resource
    Birefringence and tilted modes in ordered GaInP/AlGaInP waveguides and lasers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1217-1219 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the influence of chemical ordering on the properties of GaInP/AlGaInP optical waveguide structures and lasers. We have observed mode-conversion between transverse electric (TE) and transverse magnetic (TM) modes within typically 60 μm. We show that an ordering-induced birefringence with the optical axis tilted with respect to the growth direction is responsible for the coupling of the TE and TM modes. A new linear combination of TE and TM modes, the "super modes,'' can propagate in the waveguide without change. We show that these super modes govern the polarization of lasers made from ordered material. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115974
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  • 6
    Electronic Resource
    Electronic Resource
    Investigations on the performance of multiquantum barriers in short wavelength (630 nm) AlGaInP laser diodes (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2158-2160 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Al0.5In0.5P/Ga0.5In0.5P superlattice structures have been investigated as multiquantum barriers (MQB) in 630 nm band laser diodes in order to reduce thermal current losses. By inserting an optimized MQB, we have succeeded in improving both threshold currents and characteristic temperatures of such devices. However, the optimized dimensions of the MQB found experimentally deviated strongly from those predicted theoretically, indicating that the commonly used theoretical description assuming effective mass approximation, electron wave interference, and using transfer matrix calculation is not adequate. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123786
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  • 7
    Electronic Resource
    Electronic Resource
    Optical gain and lasing in self-assembled InP/GaInP quantum dots (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 212-214 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical gain measurements have been performed on self-assembled InP quantum dots embedded in GaInP. The dots are formed during the growth of InP on GaInP by molecular beam epitaxy due to the strong lattice mismatch and are overgrown with GaInP afterwards. The optical gain spectra show two peaks which could be clearly identified by their polarization properties as being due to the quantum dots and the wetting layer, respectively. As expected from the results of the gain measurements, optical pumping of cleaved samples at room temperature leads to lasing of either the quantum dots or the wetting layer, depending on the experimental conditions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117375
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  • 8
    Electronic Resource
    Electronic Resource
    USES FOR ORGANOMETALLICS IN FUELS AND LUBRICANTS (1965)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 125 (1965), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1965.tb45391.x
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  • 9
    Electronic Resource
    Electronic Resource
    Efficacy of different irrigation methods and concentrations of root canal irrigation solutions on bacteria in the root canal (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 8 (1992), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The effectiveness of two different root canal irrigating solutions, each in two different concentrations or formulations, with two different irrigation methods was compared in vitro by means of bacterial survival determinations. 75 human root canals were enlarged, sterilized and inoculated with a mixed culture of Escherichia coli and Streptococcus mutatis. After inoculation, the root canals were irrigated either manually or with an ultrasonic-device for equal times (20s) with the same amount (5 ml) of sodium hypochlorite (1% and 2%). Fokalhydran I and Fokalhydran II. Sodium hypochlorite (1% and 2%) was used in a 1:100 dilution. Fokalhydran 1 and II were used in a 1:10 dilution. In the sodium hypochlorite group, the 1% concentration applied with a syringe proved to be most effective against Escherichia coli and Streptococcus mutans. The least effective concentration and application method against both bacteria species was obtained with 2% NaOCL and ultrasonics. Against Escherichia coli and Streptococcus mutans, a significantly lower effectiveness was found with 2% NaOCL applied with ultrasonics with respect to the rest of the sodium hypochlorite group. Fokalhydran I was significantly better than Fokalhydran 11 against Escherichia coli. However, no significant differences could be seen against Streptococcus mutans within this group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1992.tb00218.x
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  • 10
    Electronic Resource
    Electronic Resource
    Sequence analysis of Enterococcus faecalis aggregation substance encoded by the sex pheromone plasmid pAD1 (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 4 (1990), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The location of the structural gene for aggregation substance on the sex pheromone plasmid pAD1 of Enterococcus faecalis was determined using an oligonucleotide deduced from the N-terminal amino acid sequence of the purified protein. The nucleotide sequence was determined for the corresponding region and two open reading frames (ORFs) could be identified. ORF1 codes for a small (Mr 13160) acidic protein of unknown function. The gene for aggregation substance (named asa1 was found to code for a protein of 1296 amino acids (Mr 142248). The protein has a signal peptide of 43 amino acids (the resulting (Mr for mature aggregation substance is 137429) and contains in its C-terminal region a proline-rich sequence, previously characterized as being involved in cell wall association, which is followed by a membrane anchor. The membrane anchor showed significant similarity to that of other Gram-positive organisms, but no other similarities to surface proteins from Gram-positive bacteria were found. In particular, no repeats on the DNA or protein level could be detected for pAD1-specific aggregation substance. The protein contains the amino acid motifs Arg-Gly-Asp-Ser and Arg-Gly-Asp-Val (once each), which, it is proposed, play a crucial role in adherence to eukaryotic cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1990.tb00662.x
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