Designing Multi-functional Metamaterials

The ability to design passive structures that perform different operations on different electromagnetic fields is key to many technologies, from beam–steering to optical computing. While many techniques have been developed to optimise structure to achieve specific functionality through inverse design, designing multi–function materials remains challenging. We present a semi–analytic method, based on the discrete dipole approximation, to design multi–functional metamaterials. To demonstrate the generality of our method, we design a device that operates at optical wavelengths and beams light into different directions depending on the source polarisation and a device that works at microwave wavelengths and sorts plane waves by their angle of incidence. ∗ jrc232@exeter.ac.uk 1 ar X iv :2 20 4. 11 60 5v 1 [ ph ys ic s. ap pph ] 2 1 A pr 2 02 2