Emission of Terahertz Electromagnetic Waves by Femtosecond Laser Pulse Irradiation in Solids and Its Application to Materials Science

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  • Kida Noriaki
    東京大学大学院新領域創成科学研究科
  • Miyamoto Tatsuya
    東京大学大学院新領域創成科学研究科
  • Okamoto Hiroshi
    東京大学大学院新領域創成科学研究科 産総研・東大先端オペランド計測技術オープンイノベーションラボラトリ

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Other Title
  • フェムト秒レーザーパルス励起によるテラヘルツ波放射とその物性研究への応用
  • フェムトビョウ レーザーパルス レイキ ニ ヨル テラヘルツハ ホウシャ ト ソノ ブッセイ ケンキュウ エ ノ オウヨウ

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Abstract

<p>Terahertz radiation from a solid with no inversion symmetry irradiated with a femtosecond laser pulse is widely used as a light source in spectroscopy in the terahertz region. In this paper, we report that such a terahertz-radiation process itself can be used to study physical properties of solids associated with ferroelectric polarization and ferromagnetic magnetization, and their sub-picosecond dynamics. We show that a terahertz wave is emitted via the electric-dipole radiation mechanism from organic ferroelectrics and can be utilized to map out ferroelectric domain structures. We also demonstrate that the magnetic domain imaging in ferro (ferri)-magnets is possible by detecting a terahertz radiation induced via the magnetic-dipole radiation. In addition, we report new kinds of terahertz-radiation phenomena; a terahertz radiation with high efficiency in a photoinduced ferroelectric to paraelectric transition, a narrow-band terahertz radiation by an impulsive stimulated Raman process, and a terahertz radiation by a spin-polarized current.</p>

Journal

  • Butsuri

    Butsuri 74 (5), 314-324, 2019-05-05

    The Physical Society of Japan

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