Journal of Infrared, Millimeter, and Terahertz Waves

, Volume 38, Issue 9, pp 1107–1119 | Cite as

Direct Measurements of Terahertz Meta-atoms with Near-Field Emission of Terahertz Waves

  • Kazunori Serita
  • Juraj Darmo
  • Iwao Kawayama
  • Hironaru Murakami
  • Masayoshi Tonouchi
Article

Abstract

We present the direct measurements of terahertz meta-atoms, an elementary unit of metamaterials, by using locally generated terahertz waves in the near-field region. In contrast to a conventional far-field terahertz spectroscopy or imaging, our technique features the localized emission of coherent terahertz pulses on a sub-wavelength scale, which has a potential for visualizing details of dynamics of each meta-atom. The obtained data show the near-field coupling among the meta-atoms and the impact of the electric field distribution from the excited meta-atom to neighbor meta-atoms. The observable LC resonance response is enhanced with an increase of numbers of meta-atoms. Furthermore, our approach also has a potential for visualizing the individual mode of meta-atom at different terahertz irradiation spots. These data can help us to understand the important role of the meta-atom in metamaterials and develop the novel terahertz components and devices such as active terahertz metamaterial and compact, high-sensitive bio-sensor devices.

Keywords

Terahertz Metamaterial Meta-atom Near-field Nonlinear optical crystal 

Notes

Acknowledgments

This work was partially supported by JSPS KAKENHI Grant Numbers JP15K18053 and JP17H01269.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Kazunori Serita
    • 1
  • Juraj Darmo
    • 1
    • 2
  • Iwao Kawayama
    • 1
  • Hironaru Murakami
    • 1
  • Masayoshi Tonouchi
    • 1
  1. 1.Institute of Laser EngineeringOsaka UniversityOsakaJapan
  2. 2.Photonics InstituteVienna University of TechnologyViennaAustria

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