Fig. 5From: Directly wireless communication of human minds via non-invasive brain-computer-metasurface platformMore functions of versatile wavefront syntheses using EBCM. a The experiment photograph of the pattern encoding scheme. b The illustration of beam scanning by EBCM. The visual-staring of BCI operator directly drives the metasurface to adjust the scattering direction to the desired angle. Each button relates to a specific scattering direction as labelled. c Three typical EM functions including beam scanning, OAM-beam generation, and RCS control. d–g The simulated results of four kinds beam-scanning fields, where the measured result of the main direction is marked with the red cross, as listed in Supplementary Note S6 [36]. The scattering beam is deflected from 0° to 45° along the x-axis. g–j The simulated field results of RCS control, where ‘01’ to ‘04’ indicate the four levels of reflection intensity. k, l The far-field simulation results of OAM modes + 1 and + 2. The central null is clearly observedBack to article page