Design of a low-crosstalk zoom achromatic full-Stokes metasurface

Abstract As an advanced optical imaging method, polarization imaging technology introduces polarization dimension information on the basis of traditional imaging. It can simultaneously acquire the polarization characteristics of targets and backgrounds, thereby significantly improving the imaging recognition and analysis capabilities. In this paper, a mid-infrared full-Stokes polarization focal plane zoom metasurface operating in the 4.5–5 μ m waveband is designed. Based on an all-silicon dielectric design, this structure has real-time zoom capability and exhibits lower dispersion and smaller polarization crosstalk compared with the modulation mechanisms of existing zoom metalenses. Simulation results show that the full width at half maximum of the focal spot formed by the metasurface is close to the diffraction limit under different polarization states and wavelengths. With its simple structure and weak crosstalk, this design has broad application prospects in the fields of mid-infrared polarization imaging and optical system integration.