Fig. 2: The different input structures to perform three recognition tasks.
From: Terahertz spoof plasmonic neural network for diffractive information recognition and processing
a Basis vector classification. b The input structure of class 1, in which network input ports are labeled as ports 2–5. c The transmission (S21, S31, S41, and S51) and phase results of the input structure, in which the blue structure represents the designed SSPP load featuring a nickel metal42. d Multi-user communication application. e The input structure to mimic the user information. f, g The amplitude and phase information between the input and output ports. h Handwritten digits’ classification. i The diffractive architecture to directly recognize the image. j, k The collected amplitude and phase information by 12 receivers.
