Photonic computing method uses electromagnetic waves to solve partial differential equations rapidly

https://spie.org/news/photonic-computing-harnesses-electromagnetic-waves#_=_

"model phenomena such as heat diffusion, particle motion, wave propagation, solving Helmholtz wave equation... less: time-consuming, computationally intensive... high-speed calculations using light–matter interactions... interconnected waveguide metatronic network filled with dielectric inserts mimicking circuit elements... effectively behaves like a grid of T-circuits... adjusting dielectric inserts' dimensions/ permittivity helps solve various boundary value problems, such as EM wave scattering and light focusing"