Simultaneous 3D and Full Stokes Polarization Imaging Based on All-Dielectric Metalens Network

Abstract

Compared with conventional intensity imaging, 3D and full Stokes polarization imaging can obtain higher-dimensional information about the objects. Here, a simultaneous 3D and full Stokes polarization imaging method using an all-dielectric metalens network (ADMN) has been proposed and experimentally demonstrated. The proposed ADMN is composed of three sub-metalenses simultaneously working for 0°/90°, 45°/135° linear polarization (LP), and left/right-handed circular polarization (L/RCP), respectively, from which the full Stokes polarization images can be obtained. Simultaneously, the 3D images of the object can be constructed by the parallaxes among different images obtained by different sub-metalenses. At the design wavelength of 532 nm, experimental results show that the averaged extinction ratios of the LP and CP of the fabricated ADMN are ≈10:1 and ≈23:1, respectively. The typical depth range of the 3D imaging reaches 250 mm with a diameter of the sub-metalenses of 1.2 mm and a baseline distance of 65 mm between sub-metalenses, and the average relative measurement accuracy is ≈0.8%. The proposed method provides new ideas for simultaneous 3D and full Stokes polarization imaging, target recognition, and stress detection.