Terahertz detection in a slit-grating-gate field-effect-transistor structure

Details Terahertz detection in a slit-grating-gate field-effect-transistor structure Terahertz detection in a slit-grating-gate field-effect-transistor structure

2011-10-09

arxiv.org/abs/1110.1797v1

Physics

Condensed Matter

Materials Science

9 pages, 3 figures

Scientific paper

We have fabricated a grating-gate InGaAs/GaAs field-effect transistor structure with narrow slits between the grating gate fingers. The resonant photoconductive response of this structure has been measured in the sub-terahertz frequency range. The frequencies of the photoresponse peaks correspond to the excitation of the plasmon resonances in the structure channel. The obtained responsivity exceeds the responsivity reported previously for similar plasmonic terahertz detectors by two orders of magnitude due to enhanced coupling between incoming terahertz radiation and plasmon oscillations in the slit-grating-gate field-effect transistor structure.

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