講演情報
[22a-C301-2]Evaluation of Reflective Characteristics of Meta-atoms Employing Point Terahertz Sources and Its Application
〇(D)LUWEI ZHENG1, Kazuki Hara1, Masayoshi Tonouchi1, Kazunori Serita1 (1.Institude of Laser Engineering, Osaka Univ.)
キーワード：
THz meta-atoms、Near Field
This study presents an investigation into the reflective properties of terahertz (THz) meta-atoms, which are fundamental components of metamaterials. The evaluation involves the use of point THz sources positioned in the near-field region. The local generation of near-field THz emission is achieved through the process of optical rectification within a non-linear optical crystal, specifically GaAs, under femtosecond laser irradiation at a focused spot. This emission effectively excites the meta-atoms, resulting in a modulation of their resonance states. The reflected THz wave pulses are detected employing a conventional THz time-domain spectroscopy technique. The findings indicate that meta-atoms with diverse configurations exhibit substantial potential for highly sensitive interactions, primarily driven by the electric-field-coupling effect. As a consequence, this phenomenon enables improved spatial resolution and enhanced detection sensitivity. These findings hold significant promise for the advancement of industrial and medical applications, particularly those requiring micro-scale resolution, as well as for the development of THz lab-on-chip devices capable of highly sensitive bio-sensing and trace amount detection.