Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 38, Issue 9, Pages 1107-1119Publisher
SPRINGER
DOI: 10.1007/s10762-017-0417-7
Keywords
Terahertz; Metamaterial; Meta-atom; Near-field; Nonlinear optical crystal
Funding
- JSPS KAKENHI [JP15K18053, JP17H01269]
- Grants-in-Aid for Scientific Research [15K18053] Funding Source: KAKEN
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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.
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