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  • AIP Publishing  (13)
  • 2005-2009  (13)
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  • AIP Publishing  (13)
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  • 2005-2009  (13)
Year
Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    Pulsed wire magnetic field measurement on the permanent magnet focusing device of millimeter-wave traveling wave tube
    AIP Publishing ; 2008
    In:  Journal of Applied Physics Vol. 103, No. 7 ( 2008-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 103, No. 7 ( 2008-04-01)
    Abstract: In our case, the pulsed wire method is applied to the magnetic field measurement of the permanent magnets in focusing device of millimeter-wave traveling wave tube (TWT). The focusing device using permanent magnets is used to help the electron beam keep shape and make it possible go through the slow-wave circuit, effectively interact with the microwave field and well received by collectors, which makes the measurement become a key factor for the development of the millimeter-wave TWT technique. Furthermore, the wire method can be extended used to magnetic field measurement of the magnet with small via hole. The pulsed wire technique is based on the excitation of the harmonics of a wire vibration by Lorenz forces between current in a wire and the surrounding magnetic field. Knowing the amplitude and the phase of the various harmonics of the wire vibration, one can easily reconstruct the surrounding magnetic field. As sensitive the wire system is, ultrastable supporters, high accurate mechanical adjusters, precise light and electric centering device are installed and relevant parameters are properly chosen. In addition, shorter wire is used to reduce the sag, and a simple and effective wire-position detector providing accuracy up to 1μm is designed and tested. Experiment confirms the theoretical conclusions and shows a positive future of application. The prototype system can show several relevant results, e.g., three-dimensional magnetic intensity distribution, maximum, minimum, and medium magnetic inductions, pole pitch error, etc.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2834449
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Photoresistances of semi-insulating GaAs photoconductive switch illuminated by 1.064 μm laser pulse
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 106, No. 2 ( 2009-07-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 106, No. 2 ( 2009-07-15)
    Abstract: The Shockley–Read–Hall model (SRHM) and its simplified model (SSRHM) were used to describe the characteristics of a photoconductive semiconductor switch (PCSS) made from a semi-insulating (SI) gallium arsenide (GaAs) chip, biased at low voltage, and illuminated by a 1.064 μm laser pulse. These characteristics include the free carrier densities, dynamic photoresistance, and time evolution of output pulses of the PCSS. The deep donor EL2 centers in SI GaAs play a dominant role in both the SRHM and SSRHM as electrons at EL2 unionized centers are strongly excited by the subband-gap photons at the wavelength of 1.064 μm. Theoretical modeling on the evolution of the experimental measured output pulses led to a two-step micromechanism of electron excitation process within the GaAs chip. The minimum photoresistances predicted by the SSRHM are in good agreement with experimental measurements, which confirms the dominant role of EL2 in the generation of electric pulses from a SI GaAs photoconductivity switch on which the 1064 nm laser pulse is illuminated.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3172668
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 3
    Online Resource
    Online Resource
    30 - nm -wide aluminum nanowire grid for ultrahigh contrast and transmittance polarizers made by UV-nanoimprint lithography
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 14 ( 2006-10-02)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 14 ( 2006-10-02)
    Abstract: Both high contrast and high transmittance are preferred for optical polarizers. To achieve high transmittance for aluminum nanowire-grid polarizers, a narrow linewidth is required. In this letter, aluminum nanowire-grid polarizers with 30-nm-wide linewidth and 200nm depth were fabricated by UV-nanoimprint lithography, which leads to ultrahigh transmittance. To achieve a high contrast, the authors fabricated the 30-nm-wide aluminum nanowire structures on both sides of the glass wafers. An extremely high contrast up to 10 000:1 was achieved, in the visible range, along with good transmittance of 83%–87% for the double-side aluminum nanowire-grid polarizers.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2358813
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Large flexible nanowire grid visible polarizer made by nanoimprint lithography
    AIP Publishing ; 2007
    In:  Applied Physics Letters Vol. 90, No. 6 ( 2007-02-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 90, No. 6 ( 2007-02-05)
    Abstract: 117 and 150nm pitch polymer gratings were successfully fabricated on plastic substrate over large area by nanoimprint lithography. Nanowire-grid polarizers were made by depositing Al on the sidewalls of the gratings at oblique angles. The effects of grating period, grating linewidth, Al depth, and thickness were studied in detail. Excellent contrast (∼1000:1) and high transmittance (80%–90%) (without antireflection coating) at the wavelength of 500nm and above were demonstrated.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2472532
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Analysis of thermal aberrations in a high average power single-stage Ti:sapphire regenerative chirped pulse amplifier: Simulation and experiment
    AIP Publishing ; 2006
    In:  Review of Scientific Instruments Vol. 77, No. 10 ( 2006-10-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 77, No. 10 ( 2006-10-01)
    Abstract: We present a systematic investigation of thermal loading effects in single-stage high average power regenerative chirped pulse amplifiers based on Ti:sapphire. Using finite element analysis (FEA), we compute the temperature distributions, optical path deformations (OPDs), and corresponding thermal focal lengths for a variety of pumping conditions. We experimentally characterize thermal aberrations in a regenerative amplifier using a variety of techniques (interferometry, pump-probe thermal lens power, and M2 analysis). We find excellent agreement between the FEA modeling and experimental measurements of OPDs. Our methods allow us to predict the optimal pumping conditions for minimizing thermal aberrations for a variety of geometries and pumping conditions.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.2360989
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 6
    Online Resource
    Online Resource
    High-performance, large area, deep ultraviolet to infrared polarizers based on 40 nm line/78 nm space nanowire grids
    AIP Publishing ; 2007
    In:  Applied Physics Letters Vol. 90, No. 6 ( 2007-02-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 90, No. 6 ( 2007-02-05)
    Abstract: Large-area, 100mm in diameter, aluminum nanowire grids with 40nm line/78nm space were fabricated with full-wafer immersion interference lithography. The aluminum nanowire grids with a 59nm half-pitch work as a highly efficient optical polarizer for deep ultraviolet wavelength down to ∼250nm. In addition, an extremely high contrast from 10 000:1 to 50 000:1 was achieved across the whole visible and near-infrared wavelength range, along with good transmittance (85%–90%). The broadband large-area high-performance polarizer operating down to deep ultraviolet wavelength opens up applications including semiconductor lithography and metrology applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2437731
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Discrete Kato-type theorem on inviscid limit of Navier-Stokes flows
    AIP Publishing ; 2007
    In:  Journal of Mathematical Physics Vol. 48, No. 6 ( 2007-06-01)
    Details
    In: Journal of Mathematical Physics, AIP Publishing, Vol. 48, No. 6 ( 2007-06-01)
    Abstract: The inviscid limit of wall bounded viscous flows is one of the unanswered central questions in theoretical fluid dynamics. Here we present a somewhat surprising result related to numerical approximation of the problem. More precisely, we show that numerical solutions of the incompressible Navier-Stokes equations converge to the exact solution of the Euler equations at vanishing viscosity and vanishing mesh size provided that small scales of the order of ν∕U in the directions tangential to the boundary are not resolved in the scheme. Here ν is the kinematic viscosity of the fluid and U is the typical velocity taken to be the maximum of the shear velocity at the boundary for the inviscid flow. Such a result is somewhat counterintuitive since the convergence is ensured even in the case that small scales predicted by the conventional theory of turbulence and boundary layer are not resolved since under-resolution (which is allowed in our theorem) in advection dominated problem usually leads to oscillation which inhibits convergence in general. The result also indicates possible difficulty in terms of numerical investigation of the vanishing viscosity problem if rigorous fidelity of the numerics is desired since we have to resolve at least small scales of the order of ν∕U which is much smaller than any small scales predicted by the conventional theory of turbulence. On the other hand, such a result can be viewed as a discrete version of our result [X. Wang, Indiana Univ. Math. J. 50, 223 (2001)] which generalized earlier the result of Kato [in Seminar on PDE, edited by S. S. Chern (Springer, NY, 1984)] where the relevance of a scale proportional to the kinematic viscosity to the problem of vanishing viscosity is first discovered.
    Type of Medium: Online Resource
    ISSN: 0022-2488 , 1089-7658
    URL: Article
    DOI: 10.1063/1.2399752
    RVK:
    UA 4660
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 1472481-9
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  • 8
    Online Resource
    Online Resource
    Note on the emergence of large scale coherent structure under small scale random bombardments: The discrete case
    AIP Publishing ; 2007
    In:  Journal of Mathematical Physics Vol. 48, No. 6 ( 2007-06-01)
    Details
    In: Journal of Mathematical Physics, AIP Publishing, Vol. 48, No. 6 ( 2007-06-01)
    Abstract: We continue our study on mathematical justification of the emergence of large scale coherent structure in a two dimensional fluid system under small scale random bombardments. We treat the case of small scale random bombardments at discrete times which is different from our earlier work [Commun. Pure Appl. Math. 59, 467 (2006)], where we approximated the small scale random kicks by a continuous in time random process. In the absence of geophysical effects, the large scale structure emerging out of the small scale random forcing is the same as the case of continuous in time forcing that we studied before.
    Type of Medium: Online Resource
    ISSN: 0022-2488 , 1089-7658
    URL: Article
    DOI: 10.1063/1.2424424
    RVK:
    UA 4660
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 1472481-9
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  • 9
    Online Resource
    Online Resource
    Application of mixed interface in white-electrophosphorescent devices: An efficient approach to adjust the distributions of carriers
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 93, No. 11 ( 2008-09-15)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 93, No. 11 ( 2008-09-15)
    Abstract: The distributions of carriers in white organic light-emitting devices can be tuned effectively by incorporating a mixed interface layer, consisting of 4,7-diphenyl-1,10-phenanthroline doped in N,N′-dicarbazolyl-4-4′-biphenyl. By adjusting the thickness and the BPhen concentration of the mixed interface, the optimal devices exhibit maximum current and power efficiencies of 20.9 cd/A and 19.9 lm/W, respectively, and slightly modified Commission Internationale De L’Eclairage coordinates, from (0.3174 0.3276) to (0.3141 0.3218). This is attributed to the good distributions of carriers between two emissive layers by inserting the mixed interface, thereby improving both the exciton formation probability and the charge transport balance.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2976132
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Performance enhancement of white-electrophosphorescent devices incorporating a mixed-transition layer
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 12 ( 2008-03-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 12 ( 2008-03-24)
    Abstract: The performance of white organic light-emitting devices has been improved significantly by incorporating a mixed-transition layer, consisting of the hole-transporting (or electron-transporting) layer doped with the emissive dye. These devices exhibit maximum current and power efficiencies of 13.3cd∕A and 11.3lm∕W, respectively (1.6 and 2 times higher than the corresponding values of devices without the mixed-transition layer), with slightly modified Commission Internationale De L’Eclairage coordinates, from (0.300, 0.371) to (0.312, 0.366). This is attributed to the enhancement of carrier transport by doping, thereby improving both the exciton formation probability and the charge transport balance.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2896606
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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