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Control of propagation velocity of sub-picosecond electrical signals on the micro strip lines involving quantum wells

Research Project

Project/Area Number 15560032
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

KADOYA Yutaka  Hiroshima University, Graduate School of Advanced Sciences of Matter, Professor, 大学院・先端物質科学研究科, 教授 (90263730)

Co-Investigator(Kenkyū-buntansha) KITAGAWA Jiro  Hiroshima University, Graduate School of Advanced sciences of matter, Research Associate, 大学院・先端物質科学研究科, 助手 (90346528)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsultrafast optical response / sub-picosecond electrical signals / mirco stlip lines / semiconductor quantum well / THz electromagnetic waves / transparent conductor
Research Abstract

The major aim of this project was the control of propagation velocity of sub-picosecond electrical signals on micro strip lines (MSLs) involving semiconductor quantum wells, where electrons and holes are generated by with, for example, optical excitation. Along with the fabrication of the devices and the measurements, three-dimensional calculations of the electromagnetic fields were performed by using finite-difference-time-domain (FDTD) software. The major results are as follows.
(1)It was found that the electrical signals observed, at the beginning of this project, in the MSLs made on semiconductor substrates are those waveguided only by the single signal line formed on the substrate surface. The waveguiding by single metallic lines has been reported in microwave and optical regimes. The strip lines in THz-frequency regime, where the real and imaginary parts of the complex conductivity of metals have the values in the same level, can be a good system for the investigation on the influ … More ence of surface plasmons on the electromagnetic waveguides. We also found that the attenuation and the dispersion of the signals along the single metallic line can be even lower than the conventional MSLs, if the line is covered by a uniform dielectric films. Hence we can expect the application of single-line waveguides in the future.
(2)We successfully fabricated the MSLs where the ground plane is made of an optically-transparent conductor, ITO. In such MSLs, optical access into the region between the signal line and the ground plane is possible. It was confirmed, experimentally, that the signals whose spectral range is below 1 THz can be transmitted for more than 1 mm with good propagation characteristics. We also showed that the use of Drude model for ITO is necessary for the precise prediction of the propagation characteristics in the frequency higher than 1 THz, on the basis of the FDTD calculation.
(3)It was experimentally verified that the transmission of sub-picosecond electrical signals over a few mm is possible in the thin film MSLs in which the polymer dielectric is used.
(4)Methods for embedding semiconductor quantum wells in the MSL described above were established. In the measurement, the control of the propagation velocity was not observed, mostly because of the insufficient excitation of electrons and holes. However, since the device fabrication method established in this work has a good versatility, we can expect the progress for realizing functional MSLs in future. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (7 results)

All 2004

All Journal Article (7 results)

  • [Journal Article] Observation of Jonscher Law in AC Hopping Conduction of Electron-Doped Nanoporous Crystal 12CaO・7Al_2O_3 in THz Frequency Range2004

    • Author(s)
      Hiroyuki Harimochi
    • Journal Title

      Physical Review B 70

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evaluation of Carrier Dynamics in n-Al_xGa_<1-x>As Films by Terahertz Time-Domain Spectroscopy with Characteristic-Matrix Analysis2004

    • Author(s)
      Hiroyuki Harimochi
    • Journal Title

      Japanese Journal of Applied Physics 43

      Pages: 7320-7321

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Observation of Jonscher Law in AC Hopping Conduction of Electron-Doped Nanoporous Crystal 12CaO・7Al_2O_3 in THz Frequency Range2004

    • Author(s)
      Hiroyuki Harimochi et al.
    • Journal Title

      Physcal Review B vol.70

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evaluation of Carrier Dynamics in n-Al_xGa_<1-x>As Films by Terahertz Time-Domain Spectroscopy with Characteristic-Matrix Analysis2004

    • Journal Title

      Japanese Journal of Applied Physics vol.43

      Pages: 7320-7321

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Observation of Jonscher Law in AC Hopping Conduction of Electron-Doped Nanoporous Crystal 12CaO・7Al_2O_3 in THz Frequency Range2004

    • Author(s)
      H.Harimochi
    • Journal Title

      Physical Review B 70・19

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Evaluation of Carrier Dynamics in n-Al_xGa_<1-x>As Films by Terahertz Time-Domain Spectroscopy with Characteristic-Matrix Analysis2004

    • Author(s)
      Hiroyuki Harimochi
    • Journal Title

      Japanese Journal of Applied Physics 43・10

      Pages: 7320-7321

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Low frequency spectral enhancement of THz electromagnetic waves emitted from InAs surface with increased excitation intensity2004

    • Author(s)
      R.Yano
    • Journal Title

      Journal of Applied Physics 95・4

      Pages: 2141-2145

    • Related Report
      2004 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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