Fig. 3: Multiplexing different S-DNNs. | Light: Science & Applications

Fig. 3: Multiplexing different S-DNNs.

From: Super-resolution diffractive neural network for all-optical direction of arrival estimation beyond diffraction limits

Fig. 3

a, b Experimental results of a single-layer passive S-DNN, fabricated with PTFE F4BTME350 material, for the DOA estimation of two-target samples with an angular resolution of \(10^{\circ}\) and an angular range of \([-45^{\circ} ,55^{\circ} ]\). c–f Experimental results of a three-layer passive S-DNN, fabricated with PTFE F4BTME350 material, for the broadband DOA estimation of single-target samples at a central frequency of 27.5 GHz and between the frequency range of 25 GHz and 30 GHz. The angular resolution is designed to be \(3^{\circ}\) with an angular range of \([-15^{\circ} ,15^{\circ} ]\). g Confusion matrix of three-layer S-DNN, evaluated with ASM, for all-optical DOA estimation using the two-target test dataset with all angular permutations. Scale bar, 2 cm

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