Fig. 5
ONNs implementation based on 4f system. a Optoelectronic hybrid convolutional neural network with phase mask placed in the Fourier plane of the 4f system37. b All-optical neural network with diffractive depth neural network placed in the Fourier plane of the 4f system38. a Reprinted from ref. 37 with permission from Springer Nature: Scientific Reports. b Reprinted with permission from ref. 38 from © The American Physical Society
