Inverse designed metasurfaces for multi-wavelength full-Stokes polarisation imaging
Multispectral full-Stokes polarisation imaging has a broad range of applications, from biological cell imaging to agricultural remote surveying. For such applications, especially involving lightweight unmanned aerial vehicles like drones, it is necessary to have compact, single-shot, efficient optical systems. We present a topology-optimised metasurface design that diffractively separates a scene into spectral and polarimetric measurements, operating for 532 nm and 700 nm in a single-shot imaging system. The polarisation imaging performance of the design is shown in simulation to be robust to critical performance metrics, matching both spectral and angular bandwidth requirements. We fabricated our metasurface design by nanopatterning a TiO$_2$ thin film, and experimentally demonstrate polarisation reconstruction for two wavelengths with a single metasurface structure.