不同构型超表面偏振检测  

Polarization Detection of Metasurfaces with Different Configurations

作　　者：叶超 周钰聪 占春连 高涵 Ye Chao;Zhou Yucong;Zhan Chunlian;Gao Han(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,Zhejiang,China)

机构地区：[1]中国计量大学光学与电子科技学院,浙江杭州310018

出　　处：《光学学报》2024年第14期258-266,共9页Acta Optica Sinica

摘　　要：为了探究不同偏振构型超表面对偏振检测效果的影响,利用梯度下降法和退火优化智能算法设计制备了工作波长为1550 nm,偏振构型分别为平面、普通四面体、正四面体的3种超表面衍射光栅,实验对比了它们对完全偏振光的检测能力。结果表明,正四面体光栅的检测误差最小,具有最佳的性能:恢复得到线偏振角度的均方根误差为0.79°,小于1°;对于椭圆偏振光,方位角和椭偏角的均方根误差分别为2.93°、3.76°。另外,所设计的超表面衍射光栅在1540 nm和1560 nm同样可以实现偏振检测,具有一定的宽带性能。所提出的偏振检测超表面按需逆向设计方法和对不同偏振构型超表面偏振检测性能的研究为未来设计具有灵活、高精度检偏性能的超表面提供了技术依据。Objective Polarization is an important feature of light besides wavelength,amplitude,and phase.Different materials exhibit different polarization characteristics based on their intrinsic properties.By analyzing the changes in the polarization properties of light waves before and after being reflected by an object,information such as polarization angle and degree of polarization can be obtained.Compared to traditional spectrum detection techniques,polarization detection provides more target information,making it widely applied in fiber optic communication,remote imaging sensing,medical diagnosis,and military target recognition.However,traditional polarization detection systems are struggling to meet the trend of miniaturization and integration due to their large sizes and complexity.In recent years,the use of metasurfaces to generate and detect polarization has been proposed to realize fast and in-situ polarization detection for complex conditions.Metasurfaces are artificially designed arrays of subwavelength phase-shifting microstructures,and can flexibly control the polarization properties of light through design.Currently,the design and construction of metasurfaces with multifunctional and flexible polarization control capabilities have been carried out widely.However,the performance of metasurface diffraction gratings with different polarization configurations varies on polarization detection.In this paper,metasurface diffraction gratings with three different configurations are designed and fabricated by intelligent algorithm to analyze their influence on polarization detection.Methods An intelligent algorithm combined with a gradient descent method and simulated annealing algorithm are used to design metasurface diffraction gratings.Initially,the polarization state constraints of each diffraction order are obtained by an intermediate parameter C_n,and then the gradient descent optimization method is applied to obtain parameters that meet the preliminary phase requirements.Subsequently,to consider the influenc

关 键 词：表面光学 超表面 衍射光栅 偏振检测 偏振构型 正四面体光栅 

分 类 号：O436.3[机械工程—光学工程]