Optical computing empowers direction of arrival estimation beyond the diffraction limit

https://techxplore.com/news/2024-09-optical-empowers-diffraction-limit.html

"processing spatial electromagnetic waves, super-resolution diffractive neural network enables direction of arrival estimation at light speed without RF circuits, analog-to-digital converters, digital signal processing... higher angular resolution, more robust estimation results against input noise, requiring only single snapshot... 4-layer passive system, 1° angular resolution 4X higher... 17.9 dB average detection amplitude gain at user end... sensing latency reduced >2–4 orders magnitude... wireless sensing, communication"