Search Results - (Author, Cooperation:W. Chow)

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  1. 1
    M. A. Groenen ; A. L. Archibald ; H. Uenishi ; C. K. Tuggle ; Y. Takeuchi ; M. F. Rothschild ; C. Rogel-Gaillard ; C. Park ; D. Milan ; H. J. Megens ; S. Li ; D. M. Larkin ; H. Kim ; L. A. Frantz ; M. Caccamo ; H. Ahn ; B. L. Aken ; A. Anselmo ; C. Anthon ; L. Auvil ; B. Badaoui ; C. W. Beattie ; C. Bendixen ; D. Berman ; F. Blecha ; J. Blomberg ; L. Bolund ; M. Bosse ; S. Botti ; Z. Bujie ; M. Bystrom ; B. Capitanu ; D. Carvalho-Silva ; P. Chardon ; C. Chen ; R. Cheng ; S. H. Choi ; W. Chow ; R. C. Clark ; C. Clee ; R. P. Crooijmans ; H. D. Dawson ; P. Dehais ; F. De Sapio ; B. Dibbits ; N. Drou ; Z. Q. Du ; K. Eversole ; J. Fadista ; S. Fairley ; T. Faraut ; G. J. Faulkner ; K. E. Fowler ; M. Fredholm ; E. Fritz ; J. G. Gilbert ; E. Giuffra ; J. Gorodkin ; D. K. Griffin ; J. L. Harrow ; A. Hayward ; K. Howe ; Z. L. Hu ; S. J. Humphray ; T. Hunt ; H. Hornshoj ; J. T. Jeon ; P. Jern ; M. Jones ; J. Jurka ; H. Kanamori ; R. Kapetanovic ; J. Kim ; J. H. Kim ; K. W. Kim ; T. H. Kim ; G. Larson ; K. Lee ; K. T. Lee ; R. Leggett ; H. A. Lewin ; Y. Li ; W. Liu ; J. E. Loveland ; Y. Lu ; J. K. Lunney ; J. Ma ; O. Madsen ; K. Mann ; L. Matthews ; S. McLaren ; T. Morozumi ; M. P. Murtaugh ; J. Narayan ; D. T. Nguyen ; P. Ni ; S. J. Oh ; S. Onteru ; F. Panitz ; E. W. Park ; H. S. Park ; G. Pascal ; Y. Paudel ; M. Perez-Enciso ; R. Ramirez-Gonzalez ; J. M. Reecy ; S. Rodriguez-Zas ; G. A. Rohrer ; L. Rund ; Y. Sang ; K. Schachtschneider ; J. G. Schraiber ; J. Schwartz ; L. Scobie ; C. Scott ; S. Searle ; B. Servin ; B. R. Southey ; G. Sperber ; P. Stadler ; J. V. Sweedler ; H. Tafer ; B. Thomsen ; R. Wali ; J. Wang ; S. White ; X. Xu ; M. Yerle ; G. Zhang ; J. Zhang ; S. Zhao ; J. Rogers ; C. Churcher ; L. B. Schook
    Nature Publishing Group (NPG)
    Published 2012
    Staff View
    Publication Date:
    2012-11-16
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Demography ; Genome/*genetics ; Models, Animal ; Molecular Sequence Data ; *Phylogeny ; Population Dynamics ; Sus scrofa/*classification/*genetics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    K. Howe ; M. D. Clark ; C. F. Torroja ; J. Torrance ; C. Berthelot ; M. Muffato ; J. E. Collins ; S. Humphray ; K. McLaren ; L. Matthews ; S. McLaren ; I. Sealy ; M. Caccamo ; C. Churcher ; C. Scott ; J. C. Barrett ; R. Koch ; G. J. Rauch ; S. White ; W. Chow ; B. Kilian ; L. T. Quintais ; J. A. Guerra-Assuncao ; Y. Zhou ; Y. Gu ; J. Yen ; J. H. Vogel ; T. Eyre ; S. Redmond ; R. Banerjee ; J. Chi ; B. Fu ; E. Langley ; S. F. Maguire ; G. K. Laird ; D. Lloyd ; E. Kenyon ; S. Donaldson ; H. Sehra ; J. Almeida-King ; J. Loveland ; S. Trevanion ; M. Jones ; M. Quail ; D. Willey ; A. Hunt ; J. Burton ; S. Sims ; K. McLay ; B. Plumb ; J. Davis ; C. Clee ; K. Oliver ; R. Clark ; C. Riddle ; D. Elliot ; G. Threadgold ; G. Harden ; D. Ware ; S. Begum ; B. Mortimore ; G. Kerry ; P. Heath ; B. Phillimore ; A. Tracey ; N. Corby ; M. Dunn ; C. Johnson ; J. Wood ; S. Clark ; S. Pelan ; G. Griffiths ; M. Smith ; R. Glithero ; P. Howden ; N. Barker ; C. Lloyd ; C. Stevens ; J. Harley ; K. Holt ; G. Panagiotidis ; J. Lovell ; H. Beasley ; C. Henderson ; D. Gordon ; K. Auger ; D. Wright ; J. Collins ; C. Raisen ; L. Dyer ; K. Leung ; L. Robertson ; K. Ambridge ; D. Leongamornlert ; S. McGuire ; R. Gilderthorp ; C. Griffiths ; D. Manthravadi ; S. Nichol ; G. Barker ; S. Whitehead ; M. Kay ; J. Brown ; C. Murnane ; E. Gray ; M. Humphries ; N. Sycamore ; D. Barker ; D. Saunders ; J. Wallis ; A. Babbage ; S. Hammond ; M. Mashreghi-Mohammadi ; L. Barr ; S. Martin ; P. Wray ; A. Ellington ; N. Matthews ; M. Ellwood ; R. Woodmansey ; G. Clark ; J. Cooper ; A. Tromans ; D. Grafham ; C. Skuce ; R. Pandian ; R. Andrews ; E. Harrison ; A. Kimberley ; J. Garnett ; N. Fosker ; R. Hall ; P. Garner ; D. Kelly ; C. Bird ; S. Palmer ; I. Gehring ; A. Berger ; C. M. Dooley ; Z. Ersan-Urun ; C. Eser ; H. Geiger ; M. Geisler ; L. Karotki ; A. Kirn ; J. Konantz ; M. Konantz ; M. Oberlander ; S. Rudolph-Geiger ; M. Teucke ; C. Lanz ; G. Raddatz ; K. Osoegawa ; B. Zhu ; A. Rapp ; S. Widaa ; C. Langford ; F. Yang ; S. C. Schuster ; N. P. Carter ; J. Harrow ; Z. Ning ; J. Herrero ; S. M. Searle ; A. Enright ; R. Geisler ; R. H. Plasterk ; C. Lee ; M. Westerfield ; P. J. de Jong ; L. I. Zon ; J. H. Postlethwait ; C. Nusslein-Volhard ; T. J. Hubbard ; H. Roest Crollius ; J. Rogers ; D. L. Stemple
    Nature Publishing Group (NPG)
    Published 2013
    Staff View
    Publication Date:
    2013-04-19
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Chromosomes/genetics ; Conserved Sequence/*genetics ; Evolution, Molecular ; Female ; Genes/genetics ; Genome/*genetics ; Genome, Human/genetics ; Genomics ; Humans ; Male ; Meiosis/genetics ; Molecular Sequence Annotation ; Pseudogenes/genetics ; Reference Standards ; Sex Determination Processes/genetics ; Zebrafish/*genetics ; Zebrafish Proteins/genetics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Staff View
    Publication Date:
    2014-10-11
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Adenocarcinoma/*genetics/pathology ; DNA Mutational Analysis ; Exome/genetics ; Genes, Neoplasm ; *Genetic Heterogeneity ; Humans ; Lung Neoplasms/*genetics/pathology ; Mutation ; Neoplasm Recurrence, Local/*genetics/pathology
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Fischer, A. J. ; Choquette, K. D. ; Chow, W. W. ; Hou, H. Q. ; Geib, K. M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We report the operation of an electrically injected monolithic coupled resonator vertical-cavity laser which consists of an active cavity containing InxGa1−xAs quantum wells optically coupled to a passive GaAs cavity. This device demonstrates modulation characteristics arising from dynamic changes in the coupling between the active and passive cavities. A composite mode theory is used to model the output modulation of the coupled resonator vertical-cavity laser. It is shown that the laser intensity can be modulated by either forward or reverse biasing the passive cavity. Under forward biasing, the modulation is due to carrier induced changes in the refractive index, while for reverse bias operation the modulation is caused by field dependent cavity enhanced absorption. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.125220

    Articles: DFG German National Licenses
  5. 5
    Chow, W. W. ; Wright, A. F.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    This letter describes a microscopic gain theory for an InGaN/AlGaN quantum well laser. The approach, which is based on the semiconductor Bloch equations, with carrier correlations treated at the level of quantum kinetic theory in the Markovian limit, gives a consistent treatment of plasma and excitonic effects, both of which are important under lasing conditions. Inhomogeneous broadening due to spatial variations in quantum well thickness or composition is taken into account by a statistical average of the homogeneously broadened spectra. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.120155

    Articles: DFG German National Licenses
  6. 6
    Chow, W. W. ; Corzine, S. W. ; Young, D. B. ; Coldren, L. A.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The temperature dependence of the threshold in a vertical-cavity surface-emitting laser is investigated. Comparison of theory with experiment indicates that many-body Coulomb interactions play an important role. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.113995

    Articles: DFG German National Licenses
  7. 7
    Chow, W. W. ; Schneider, R. P. ; Lott, J. A. ; Choquette, K. D.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The wavelength dependence of the threshold in an InGaP-InAlGaP vertical cavity surface emitting laser is investigated using a microscopic theory of the semiconductor gain medium. Good agreement is found between experiment and theory for the minimum threshold lasing wavelength for a range of laser structures.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.112972

    Articles: DFG German National Licenses
  8. 8
    Pereira, M. F. ; Koch, S. W. ; Chow, W. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1991
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A many-body theory for the optical susceptibility in highly excited strained-layer quantum wells is presented. Gain spectra are computed for the example of InxGa1−xAs/InP and different In concentrations, yielding zero, tensile, and compressive strain.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.105830

    Articles: DFG German National Licenses
  9. 9
    Chow, W. W. ; Pereira, M. F. ; Koch, S. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1992
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The carrier density modulation response of a semiconductor laser medium is analyzed. The differential gain and linewidth enhancement factor are computed as functions of strain and threshold gain. The example of InGaAs/InP with different InAs content is used to illustrate the situations of zero, tensile and compressive strain.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.107789

    Articles: DFG German National Licenses
  10. 10
    Chow, W. W. ; Koch, S. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    This letter investigates the gain medium properties in II–VI blue-green quantum well semiconductor lasers, including band structure and carrier interactions in the electron-hole plasma are found to be significantly more important than in infrared III–V lasers. In particular, the interband Coulombic enhancement of the optical transitions, together with a band gap renormalization result in an increase in gain and a reduction in the antiguiding or linewidth enhancement factor. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.114258

    Articles: DFG German National Licenses
  11. 11
    Chow, W. W. ; Knorr, A. ; Koch, S. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A many-body calculation of the nonlinear optical response of bulk group-III nitrides is presented. For the example of GaN it is shown that the Coulomb effects contribute significantly to the magnitude and spectral extension, as well as the temperature and carrier density dependences of the optical gain and absorption. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.115215

    Articles: DFG German National Licenses
  12. 12
    Ru, P. ; Chow, W. W. ; Moloney, J. V. ; Koch, S. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The gain medium effects on the lateral mode stability of an unstable resonator semiconductor laser are investigated. A physical optics laser model based on a many-body semiclassical laser theory of the gain medium is used. The consistent treatment of bulk, quantum well, and strained quantum well structures shows that quantum confinement or strain can result in single lateral mode operation over significantly wider ranges of unstable resonator configurations and gain medium excitation.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.111888

    Articles: DFG German National Licenses
  13. 13
    Chow, W. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The quantum-confined Stark effect was found to result in a strong quantum-well width dependence of threshold current density in strained group-III nitride quantum well lasers. For an In0.2Ga0.8N/GaN structure with quantum-well width in the neighborhood of 3.5 nm, our analysis shows that the reduction in spontaneous emission loss by the electron–hole spatial separation outweighs the corresponding reduction in gain to produce a threshold current-density minimum. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.124336

    Articles: DFG German National Licenses
  14. 14
    Hader, J. ; Bossert, D. ; Stohs, J. ; Chow, W. W. ; Koch, S. W. ; Moloney, J. V.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The linewidth enhancement factor in single quantum-well graded index separate confinement heterostructure semiconductor lasers is investigated theoretically and experimentally. For thin wells, a small linewidth enhancement factor is obtained which clamps with increasing carrier density, in contrast to the monotonous increase observed for thicker wells. Microscopic many-body calculations reproduce the experimental observations attributing the clamping to excitation dependent gain shifts and the influence of the population of off-resonant states on the refractive index. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.123823

    Articles: DFG German National Licenses
  15. 15
    Chow, W. W. ; Wright, A. F. ; Nelson, J. S.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The determination of gain properties in group III nitride quantum wells is complicated by the incomplete knowledge of band structure properties, and the need for a consistent treatment of many-body Coulomb effects. This letter describes an approach that involves a first-principles band structure calculation, the results of which are incorporated into a microscopic laser theory where many-body Coulomb effects are treated in a consistent manner. Using this approach, we investigate quantum well structures composed of alloys of GaN, AlN, and InN, in particular, GaN–AlInN, which has high confinement potentials in both strained and unstrained configurations. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.116064

    Articles: DFG German National Licenses
  16. 16
    Chow, W. W.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A microscopic analysis of experimental GaInP quantum well gain spectra is presented for a wide range of excitation. A consistent treatment of carrier collision effects, at the level of quantum kinetic theory in the Markovian limit, is found to be necessary for agreement with experiment. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.119489

    Articles: DFG German National Licenses
  17. 17
    Choquette, Kent D. ; Chow, W. W. ; Hadley, G. R. ; Hou, H. Q. ; Geib, K. M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We analyze the threshold properties of small area selectively oxidized vertical cavity lasers. Agreement for threshold gain versus laser size is found using the experimental intrinsic threshold voltage matched with a gain theory, as compared to a two-dimensional optical cavity simulation. Our analysis indicates the increasing threshold current density of small area lasers arises from both increasing threshold gain and the concomitant increasing leakage current. We further show that the optical loss can be reduced for lasers with areas as small as 0.25 μm2 while maintaining sufficient transverse optical confinement by displacing the apertures longitudinally away from the cavity and reducing the oxide thickness. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.118234

    Articles: DFG German National Licenses
  18. 18
    Choquette, Kent D. ; Chow, W. W. ; Hagerott Crawford, M. ; Geib, K. M. ; Schneider, R. P.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We report an experimental and theoretical analysis of the threshold properties of infrared oxide-confined vertical-cavity surface emitting lasers. We find good agreement between experiment and theory on the wavelength dependencies of the threshold current density and intrinsic voltage. The threshold voltage is shown to equal the sum of the calculated quasi-Fermi energy separation and the ohmic drop arising from a record low 17 to 30 Ω series resistance in these vertical-cavity lasers. Our analysis provides two independent means for determining the material threshold gain. A threshold gain of 500 cm−1 is found for these oxide-confined lasers, which is half that estimated for ion-implanted lasers with inferior electrical and optical confinement. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.115744

    Articles: DFG German National Licenses
  19. 19
    Chow, W. W. ; Jones, E. D. ; Modine, N. A. ; Allerman, A. A. ; Kurtz, S. R.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The optical gain spectra for compressive-strained and lattice-matched GaInNAs/GaAs quantum wells are computed using a microscopic laser theory. From these spectra, the peak gain and carrier radiative decay rate as functions of carrier density are determined. These dependences allow the study of lasing threshold current density for different GaInNAs/GaAs laser structures. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.125181

    Articles: DFG German National Licenses
  20. 20
    Fischer, A. J. ; Choquette, K. D. ; Chow, W. W. ; Allerman, A. A. ; Serkland, D. K. ; Geib, K. M.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We report a monolithic coupled-resonator vertical-cavity laser with an ion-implanted top cavity and a selectively oxidized bottom cavity which exhibits single fundamental-mode operation. The output powers are as high as 6.1 mW with side mode suppression ratios greater than 30 dB. The sizes of the implant and oxide current apertures are shown to be important for demonstrating the required selectivity for the fundamental lasing mode. With a fixed bias current on the implant cavity and increasing oxide cavity current, mode switching from single-mode operation to multimode operation and back to single-mode operation was observed. The intensities of the fundamental and first transverse modes were calculated by solving a set of multimode rate equations. The calculation indicates that the observed mode switching can be identified with changes in the optical length of the oxide cavity with increasing pump current. The observed mode dynamics are unique to coupled-resonator vertical-cavity lasers. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1426254

    Articles: DFG German National Licenses