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We experimentally show that indirect light-induced electron transitions couldlead to THz detection on standard CCD and CMOS sensors, introducing thiswell-established technological concept to the THz range. Unlike its opticalcounterpart, we found that the THz sensitivity is nonlinear. We imaged 1-13 THzradiation with photon energy less than 2% of the well-established band gapenergy threshold. The unprecedented small pitch and large number of pixelsuniquely allowed us to visualize the complex propagation of THz radiation, asit focuses down to the physical diffraction limit. Broadband pulses weredetectable at a single shot. This opens a whole new field of real time THzimaging at the frame rate of the sensor.

Anomalous visualization of sub-2 THz photons on standard silicon CCD and COMS sensors