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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

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1013-9826

Key engineering materials/Journal Key engineering materials
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    Analysis of Phase Distribution of Focused Light in High Numerical Aperture Systems

    Alexander NormatovBoris SpektorJoseph Shamir
    P.616-620页
    查看更多>>摘要：High numerical aperture focusing is becoming increasingly important for nanotechnology related applications. Rigorous, vector evaluation of the focused field, in such cases, is usually performed using the Richards-Wolf method which is based on the Debye approach. The resulting field is known to have a piecewise quasi planar phase. A corresponding result, produced by a Fresnel-Kirchhoff integral for aplanatic optical systems of medium and low numerical apertures, leads to the well known physical fact that a quadratic phase exists when the entrance pupil is not located at the front focal plane. Yet, the amplitudes produced in both ways are in a good agreement. In this work we investigated the difference, presented above, in a 2D system with the help of the Stratton-Chu diffraction integral. The amplitude obtained by the Stratton-Chu integral was quite similar to the classic results while the phase exhibited a quadratic behavior, with the quadratic coefficient depending on the numerical aperture of the optical system. For lower numerical apertures it approached the result obtained by the Fresnel-Kirchhoff integral while for higher numerical apertures it was approaching the Richards-Wolf result. A mathematical expression for the quadratic coefficient was derived and verified for various values of numerical aperture.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Torsion Magnetic Variometer with Kevlar-Hanger-Based Sensor

    Yuri A. KopytenkoPavel A. SergushinMaksim S. PetrishchevValery A. Levanenko...
    P.621-624页
    查看更多>>摘要：The construction and principle of operation of the torsion magnetic variometer are discussed, some specificities of magnetic sensor such as different variants of hanger systems, brace types and magnet proportions are shown.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Device for Manufacturing Torsion Bars with Helical Anisotropy UISAT-1

    Yuri A. KopytenkoPavel A. SergushinMaksim S. PetrishchevValery A. Levanenko...
    P.625-628页
    查看更多>>摘要：The article describes the device for manufacturing torsion bars with helical anisotropy, performed as a braid made of kevlar filaments (fibers). physical and kinematic configurations are demonstrated, operation concept of the device is described. Characteristics of produced torsion bars are discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Innovations in X-Ray Induced Electron Emission Spectrometry (XIEES)

    Konstantin Ju. PogrebitskyMichael D. Sharkov
    P.631-635页
    查看更多>>摘要：In modern sciences and technologies it is required to investigate local atomic and electron structure of matter independently on its aggregate state. There are advanced methods aimed at short order. These methods are based on the phenomena accompanied by interference of secondary electrons excited by primary X-ray radiation. Such methods are known as XAFS (X-ray absorption fine structure). These methods are based mainly on using of synchrotron radiation. It is realized in two modes: 'transmission mode' and registration of secondary effects that follow the primary X-ray absorption. One may announce only two such effects: X-ray induced fluorescence and X-ray induced electron emission (photoeffect). However, the access to synchrotron rings is problematic for the most users. This fact supposes the necessity to develop laboratory devices of direct urgent access. Since the power of laboratory X-ray sources is much less than the flux from synchrotrons, it is necessary to use secondary electron detectors of considerably higher efficiency. Moreover, it is attractive to possess energy in spatial resolution. Channeltrons and multi-channel plates do not have such abilities. That is why the advanced electron detector was developed and exposed to photoeffect under acceleration field. The work is performed within the frames of ISTC Project #3157.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Tests of Model of Absolute Measuring Instrument of Synchrotron Radiation Power

    Igor A. KhrebtovValeriy G. MalyarovVladimir Yu. ZerovAnton D. Nikolenko...
    P.636-640页
    查看更多>>摘要：A model of absolute measuring instrument of power of synchrotron radiation in soft X-ray range of wavelengths of 8 - 0.4 nm based on high-temperature superconductor bolometer with electrical substitution has been developed, fabricated and tested. Tests have been carried out at the synchrotron radiation (SR) station "Cosmos" on the VEPP-4 storage ring of Budker Institute of Nuclear Physics of the SB RAS. It was ascertained that sensitivity of the device allows carrying out measurements of an SR flux power in the given spectral range. The minimum measured power was 3.2 μW. A predicted threshold sensitivity of bolometer ～10~(-10) W/Hz~(1/2) at modulation frequency of 10 Hz and analysis of other factors influencing the measurement accuracy prove it to be real to achieve a 1 % accuracy at measurement of SR flux power of about 1 μW.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Advantages in the Small-Angle Scattering of X ray for Studying Optoelectronic Devices within the Frames of ISTC Projects

    Michael E. BoikoAndrei M. Boiko
    P.641-645页
    查看更多>>摘要：The project ISTC "SPECTROMETRIC POSITION SENSITIVE DETECTOR WITH BASE ENERGY SHIFT" is interesting for creation new area semiconductor detector device for EXAFS spectroscopy, for traditional X-ray diffractometry (XRD), as well as Small-Angle X-ray Scattering diffractometry (SASX). Diffractometry methods allow creating original features of position sensitive detector. Crystallography quality of silicon multi layer detector with original photo mask was examined by XRD and SAXS with ordinary scintillation detectors. Grazed incidence SAXS (GISAXS) provides information both about lateral and normal ordering of multilayers at a surface or inside a thin epitaxial film [1]. Using high-energy X-ray source (rotating anode or synchrotron radiation in future) and high adjustment monochromator SAXS rocking curves in transition and reflection mode had been received. It allows obtaining the information of 3D size lamellar or column-like domains. Results of an experimental investigation of the size layer structure are presented.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd