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Optical neural network
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An optical neural network (ONN) is a physical implementation of an artificial neural network with optical components.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Microwave_diffractive_ANN.png/363px-Microwave_diffractive_ANN.png)
Schematic of an optical neural network that functions as a logic gate (above) and its implementation in microwave frequencies (below). The intermediate diffractive metasurfaces function as hidden layers.[1]