AI‐assisted on‐chip nanophotonic convolver based on silicon metasurface
Kun Liao, Tianyi Gan, Xiaoyong Hu, Qihuang Gong · Nanophotonics · 2018
Abstract Convolution operation is of great significance in on‐chip all‐optical signal processing, especially in signal analysis and image processing. It is a basic and important mathematical operation in the realization of all‐optical computing. Here, we propose and experimentally implement a dispersionless metalens for dual wavelengths, a 4f optical processing system, and then demonstrate the on‐chip nanophotonic convolver based on silicon metasurface with the optimization assistance of inverse design. The characteristic size of the dispersionless metalens device is 8 × 9.4 μm, and the focusing efficiency is up to 79% and 85% at wavelengths of 1000 and 1550 nm, respectively. The feature size of the convolver is 24 × 9.4 μm, and the proposed convolver allows spatial convolution operation on any desired function at dual wavelengths simultaneously. This work provides a potential scheme for the further development of on‐chip all‐optical computing.