Split Resonant Peaks Observed in a Bull's Eye Structure Using Oblique Incidence of Terahertz Waves

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  • 斜入射テラヘルツ波を用いたブルズアイ構造共鳴ピークの角度依存 分裂の観測
  • Laser Original 斜入射テラヘルツ波を用いたブルズアイ構造共鳴ピークの角度依存分裂の観測
  • Laser Original ナナメニュウシャ テラヘルツハ オ モチイタ ブルズアイ コウゾウ キョウメイ ピーク ノ カクド イソン ブンレツ ノ カンソク

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Angular dependence of extraordinary terahertz (THz)-wave transmission is investigated in a bull’s eye structure : a subwavelength aperture with concentric grooves. Split resonant peaks in transmission spectra are observed using high-resolution THz spectroscopy with an injection-seeded THz-wave parametric generator used as a bright, tunable THz-wave source. The resonant frequency at normal incidence agrees well with finite-difference time-domain calculation. With the incident angle varied from 0-5 deg, the resonant frequencies are tuned in the frequency range of 180 GHz with the rate of 18 GHz/deg. The behavior is well explained by the folded dispersion curve of surface plasmons at THz frequencies. The measured Q values are 27 at normal incidence, 11 and 14 at 5 deg.

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