摘要
Pixelated metasurfaces integrating both the functions of linear polarization and circular polarization filters on a single platform can achieve full-Stokes polarization detection.At present,the pixelated full-Stokes metasurfaces mainly face the following problems:low transmission,low circular dichroism(CD)of circular polarization filters,and high requirements in fabrication and integration.Herein,we propose high performance ultracompact all-dielectric pixelated full-Stokes metasurfaces in the near-infrared band based on silicon-on-insulator,which is compatible with the available semiconductor industry technologies.Circular polarization filters with high CD are achieved by using simple two-dimensional chiral structures,which can be easily integrated with the linear polarization filters on a single chip.In addition,the dielectric materials have higher transmission than metal materials with intrinsic absorption.We experimentally demonstrated the circular polarization filter with maximum CD up to 70%at a wavelength of 1.6μm and average transmission efficiency above 80%from 1.48μm to 1.6μm.Therefore,our design is highly desirable for many applications,such as target detection,clinical diagnosis,and polarimetric imaging and sensing.
基金
International Science and Technology Cooperation Programme(20500711300)
National Natural Science Foundation of China(61805264)
Shanghai Sailing Program(18YF1426500)
University Scientific Research Foundation of Jiangsu Province(KJS1713).
