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We report on terahertz (THz) emission from an InGaAs-based DC-current-driven dual-grating-gate high-electron-mobility transistor excited by photomixed dual continuous-wave-infrared (dual-CW-IR) laser irradiation. The difference frequency (δf) of the dual-CW-IR laser beams was set around the THz plasmon mode frequencies at different bias conditions. The radiation spectra from the device observed at 120 K showed distinctive emissions beyond the black-body radiation, which were promoted by δf-dependent coherent plasmons. The results suggest the occurrence of plasmonic boom instability stimulated by the DC current flow in the 2D channel under pertinent DC bias voltages.

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