Fig. 4

Mapping the digital electromagnetic states to the incident THz sensor response. a Transformation of the beam patterns as the detector settings are reprogrammed across the 16-dimensional space from optimal reception from broadside at 0.3–0.75 THz. The beam patterns at both the frequencies can be seen to be transformed at the sensor is reprogrammed to shape its 0.75 THz pattern in the broadside. b Similar transformation of the reception beam at 0.75 THz as the surface is reconfigured from optimal reception at broadside to 45° incidence at 0.75 THz