Fig. 5: Matrix solver based on a feedback system.
From: Nonreciprocal surface plasmonic neural network for decoupled bidirectional analogue computing
a The closed-loop network for inverse matrix computation. The network consists of three feedback waveguides that connect ports 3 and 11, 5 and 13, 7 and 15, respectively. The feedback waveguides produce recursive wave propagation within the network. Arrows indicate the direction of wave flow through the structure. b Inverse matrix computation results under two spin encoding conditions. The results (nine elements of the 3 × 3 matrix) are extracted from the output port, and the experimental (red) and theoretical (blue) data [real part (boxed) and imaginary part (unboxed)] demonstrate good consistency.
