• Title/Summary/Keyword: Polarized current

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Molecular Orientation and Polarized Absorption Characteristics of N-docosylquinolium-TCNQ LB Film (N-docosylquinolium-TCNQ LB막의 분자배향과 편광특성)

  • Choi, Kang-Hoon;Shin, Dong-Myung;Han, Won-Keun;Park, Tae-Kon;Kang, Dou-Yol
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.868-870
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    • 1992

  • Langmuir-Blodgett method is the best candidate for the development of the future molecular electronic devices. But, this molecular thin film devices requires the bulk properties that was influenced by the molecular arrangements and orientations. So, these are of current interest in molecular electronic device fabrications of new materials. In this experiment, the N-docosylquinolium-TCNQ LB films were deposited on the surface pressures of 30 mN/m and 45 mN/m. We measured the polarized UV/visible absorptions of deposited films for the study of the molecular arrangements and orientations. The polarized UV/visible absorption variation on the incidence and polarization angle of the LB film deposited on the surface pressure of 45 mN/m shown methodically variated. So, we concluded that the LB film deposited on 45 mN/mwas arranged better than that obtained at 30 mN/m.

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Study of the Magnetization Reversal Behavior of exchange-Biased System Using Polarized Neutron Reflectometry

  • Park, Sung-Kyun;Kim, Ki-Yeon;Kim, Ji-Wan;Choi, Hyeok-Cheol;Teichert, A.;You, Chun-Yeol;Shin, Sung-Cheol;Lee, Jeong-Soo;Fitzsimmons, M.R.
    • Proceedings of the Korean Magnestics Society Conference
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    • 2011.06a
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    • pp.3-3
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    • 2011

  • Since the first discovery of exchange anisotropy on Co/CoO system[1], there have been numerous studies to explore the physical origin of exchange-biased system[2,3]. In this presentation, we report that how the polarized neutron reflectomery can be applied to study the magnetization reversal behavior of the exchange biased system. As an example, the detailed magnetization reversal mechanism of the exchange-biased Py(30 nm)/FeMn (0, 15, 30 nm)/CoFe(30 nm) trilayers was studied and found that the 15 nm antiferromagnetic FeMn layer mediates the magnetization reversal behaviors of both Py and CoFe layers through interlayer exchange bias coupling. We also update the current activities in polarized neutron reflectometer in HANARO.

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Enhancement of Speckle Contrast in vivo by Combining Linearly Polarized Laser Light and an Analyzer

  • Qureshi, Muhammad Mohsin;Mac, Khuong Duy;Kim, Andrew Hyunjin;Kim, Young Ro;Chung, Euiheon
    • Current Optics and Photonics
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    • v.5 no.4
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    • pp.351-361
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    • 2021

  • Speckle imaging is capable of dynamic data acquisition at high spatiotemporal resolution, and has played a vital role in the functional study of biological specimens. The presence of various optical scatterers within the tissue causes alteration of speckle contrast. Thus structures like blood vessels can be delineated and quantified. Although laser speckle imaging is frequently used, an optimization process to ensure the maximum speckle contrast has not been available. In this respect, we here report an experimental procedure to optimize speckle contrast via applying different combinations of varying polarization of the illuminating laser light and multiple analyzer angles. Specifically, samples were illuminated by the p-polarization, 45°-polarization, and s-polarization of the incident laser, and speckle images were recorded without and with the analyzer rotated from 0° to 180° (Δ = 30°). Following the baseline imaging of a solid diffuser and a fixed brain sample, laser speckle contrast imaging (LSCI) was successfully performed to visualize in vivo mouse-brain blood flow. For oblique laser illumination, the maximum contrast achieved with p-polarized and s-polarized light was perpendicular to the analyzer's axis. This study demonstrates the optimization process for maximizing the speckle contrast, which can improve blood-flow estimation in vivo.

  • https://doi.org/10.3807/COPP.2021.5.4.351 인용 PDF KSCI

Recent Developments in Characterization of Ion-Exchange Membrane Processes: Impedance Spectroscopy for a Concentration Polarized Boundary Layer

  • Park, Jin-Soo;Moon, Seung-Hyeon
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.03a
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    • pp.1-11
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    • 2004

  • Ion-exchange membranes have been widely used in various applications such as diffusion dialysis, electrolysis, electrodialysis, fuel cell etc [1-2]. When an electric current passes through the membrane system, the current is carried by both positive and negative ions in the bulk solution phases, whereas it is carried mainly by the counter-ions in the membrane. (omitted)

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