Image information transmission based on self-rotating beam arrays encoding/decoding

The self-rotating beam (SRB) is a new type of beam obtained by modulating the metalens phase. In this paper, we propose an indoor information transmission system that encodes/decodes the modified SRB arrays. The encoded data sequence contains the spatial position and state information of the arrayed beams. In our experiments, a spatial light modulator is used as the encoder, and a 256 × 256-pixel grayscale image can be encoded and decoded using the beam arrays. The system's bit error rate (BER) can be measured. The BER was equal to zero after the images were decoded and recovered. The results demonstrate that a free-space optical communication system based on the modified SRB arrays is feasible and has acceptable performance.