Extended Data Fig. 4: Far-field infrared camera images of transmitter steering.

a, Images of several representative steering positions. The receiver fields of view corresponding to the 16 steering positions are indicated by the dashed lines, with the currently active block indicated by a solid outline. The light from the active transmit grating is first slightly defocused to completely illuminate the active block, and then structured by the microlens array. Owing to this defocusing and the soft edges of the beam, a small fraction of the transmitted light falls outside the active block. b, A zoomed-in image showing the structured illumination pattern produced by the microlens array. The locations of the bright spots coincide with the receiver pixel grating couplers.