Inverse designed metasurfaces can solve prescribed Fredholm integral equations at optical wavelengths. To this end, a mirror is included to provide the feedback required to perform the Neumann series that solves the equation.

OSA Technical Digest
Photonic Materials

Cordaro, A., Edwards, B., Nikkhah, V., Alù, A., Engheta, N., & Polman, A. (2021). Solving integral equations with inverse-designed metagratings at optical wavelengths. In CLEO: QELS 2021 - Part of Conference on Lasers and Electro-Optics. doi:10.1364/CLEO_QELS.2021.FTh2M.7