Application of plasmon-resonant microchip emitters to broadband terahertz spectroscopic measurement

Yuki Tsuda, Tsuneyoshi Komori, Abdelouahad El Fatimy, Kouhei Horiike, Tetsuya Suemitsu, Taiichi Otsuji

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We are proposing our original 2D-plasmon-resonant microchip emitter as a new terahertz light source. The structure is based on a high-electron-mobility transistor and features interdigitated dual-grating gates. The dual-grating gates can alternately modulate the 2D electron densities to periodically distribute the plasmonic cavities along the channel, acting as an antenna. The die fabricated in a 70 μm square with a double-deck InGaP/InGaAs/GaAs material system can emit 0.5-6.5 THz radiation with microwatt power even at room temperature from self-oscillating 2D plasmons under the DC-biased conditions. The microchip emitter was introduced into a Fourier-transformed far-infrared spectrometer as a light source. Its applicability to broadband terahertz spectroscopy was verified through real measurements for atmospheric water vapor and several sugar groups.

Original languageEnglish
Pages (from-to)A52-A57
JournalJournal of the Optical Society of America B: Optical Physics
Issue number9
Publication statusPublished - 2009 Sept 1

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics


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